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31121230031 = 419713757119
BaseRepresentation
bin11100111110111110…
…000100100011001111
32222022220002021211022
4130332332010203033
51002214013330111
622144043544355
72151133043033
oct347676044317
988286067738
1031121230031
1112220139821
12604652b0bb
132c1c76a018
1417133121c3
15c222a52db
hex73ef848cf

31121230031 has 16 divisors (see below), whose sum is σ = 32444616960. Its totient is φ = 29829304320.

The previous prime is 31121229989. The next prime is 31121230037. The reversal of 31121230031 is 13003212113.

It is a cyclic number.

It is not a de Polignac number, because 31121230031 - 218 = 31120967887 is a prime.

It is a super-2 number, since 2×311212300312 (a number of 22 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 = 31121229991 and 31121230009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121230037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516290 + ... + 573408.

It is an arithmetic number, because the mean of its divisors is an integer number (2027788560).

Almost surely, 231121230031 is an apocalyptic number.

31121230031 is a deficient number, since it is larger than the sum of its proper divisors (1323386929).

31121230031 is a wasteful number, since it uses less digits than its factorization.

31121230031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57394.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31121230031 its reverse (13003212113), we get a palindrome (44124442144).

The spelling of 31121230031 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty thousand, thirty-one".

Divisors: 1 41 97 137 3977 5617 13289 57119 544849 2341879 5540543 7825303 227162263 320837423 759054391 31121230031