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31213031202131 = 241129514652291
BaseRepresentation
bin1110001100011010110011…
…01000110001110101010011
311002111221021210220112012112
413012031121220301311103
513042343241441432011
6150215022451415535
76401032003443212
oct706153150616523
9132457253815175
1031213031202131
119a44410434189
123601364bb45ab
1314554b7701b3c
1479ca0c443079
15391dc8a2b58b
hex1c6359a31d53

31213031202131 has 4 divisors (see below), whose sum is σ = 31342545854664. Its totient is φ = 31083516549600.

The previous prime is 31213031202061. The next prime is 31213031202149. The reversal of 31213031202131 is 13120213031213.

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

It is a cyclic number.

It is not a de Polignac number, because 31213031202131 - 214 = 31213031185747 is a prime.

It is a super-2 number, since 2×312130312021312 (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 = 31213031202097 and 31213031202106.

It is not an unprimeable number, because it can be changed into a prime (31213031252131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64757325905 + ... + 64757326386.

It is an arithmetic number, because the mean of its divisors is an integer number (7835636463666).

Almost surely, 231213031202131 is an apocalyptic number.

31213031202131 is a deficient number, since it is larger than the sum of its proper divisors (129514652533).

31213031202131 is a wasteful number, since it uses less digits than its factorization.

31213031202131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129514652532.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31213031202131 its reverse (13120213031213), we get a palindrome (44333244233344).

The spelling of 31213031202131 in words is "thirty-one trillion, two hundred thirteen billion, thirty-one million, two hundred two thousand, one hundred thirty-one".

Divisors: 1 241 129514652291 31213031202131