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31100012012213 = 125073724865349
BaseRepresentation
bin1110001001001000010010…
…01010110010001010110101
311002010010120022100210212122
413010210021022302022311
513034020311033342323
6150051052010125325
76356621201253614
oct704441112621265
9132103508323778
1031100012012213
119a00494006aa1
1235a3483120845
131447945861c31
1479736a29d87b
1538deb184dec8
hex1c49092b22b5

31100012012213 has 4 divisors (see below), whose sum is σ = 31100038128300. Its totient is φ = 31099985896128.

The previous prime is 31100012012137. The next prime is 31100012012239. The reversal of 31100012012213 is 31221021000113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13540501186564 + 17559510825649 = 3679742^2 + 4190407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-31100012012213 is a prime.

It is a super-2 number, since 2×311000120122132 (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31100012012191 and 31100012012200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31100012012263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11181938 + ... + 13683411.

It is an arithmetic number, because the mean of its divisors is an integer number (7775009532075).

Almost surely, 231100012012213 is an apocalyptic number.

It is an amenable number.

31100012012213 is a deficient number, since it is larger than the sum of its proper divisors (26116087).

31100012012213 is a wasteful number, since it uses less digits than its factorization.

31100012012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26116086.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31100012012213 its reverse (31221021000113), we get a palindrome (62321033012326).

The spelling of 31100012012213 in words is "thirty-one trillion, one hundred billion, twelve million, twelve thousand, two hundred thirteen".

Divisors: 1 1250737 24865349 31100012012213