31312123011252 has 120 divisors (see below), whose sum is σ = 83579462366400. Its totient is φ = 10219904348544.

The previous prime is 31312123011251. The next prime is 31312123011259. The reversal of 31312123011252 is 25211032121313.

31312123011252 is a `hidden beast` number, since 3 + 1 + 312 + 1 + 230 + 112 + 5 + 2 = 666.

It is a super-2 number, since 2×31312123011252² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312123011251) 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 39 ways as a sum of consecutive naturals, for example, 2301102 + ... + 8241317.

It is an arithmetic number, because the mean of its divisors is an integer number (696495519720).

Almost surely, 2^{31312123011252} is an apocalyptic number.

It is an amenable number.

31312123011252 is an abundant number, since it is smaller than the sum of its proper divisors (52267339355148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31312123011252 is a wasteful number, since it uses less digits than its factorization.

31312123011252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542627 (or 10542616 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 31312123011252 its reverse (25211032121313), we get a palindrome (56523155132565).

The spelling of 31312123011252 in words is "thirty-one trillion, three hundred twelve billion, one hundred twenty-three million, eleven thousand, two hundred fifty-two".