31145021531256 has 16 divisors (see below), whose sum is σ = 77862553828200. Its totient is φ = 10381673843744.

The previous prime is 31145021531251. The next prime is 31145021531269. The reversal of 31145021531256 is 65213512054113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31145021531251) 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, 648854615211 + ... + 648854615258.

Almost surely, 2^{31145021531256} is an apocalyptic number.

It is an amenable number.

31145021531256 is an abundant number, since it is smaller than the sum of its proper divisors (46717532296944).

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

31145021531256 is a wasteful number, since it uses less digits than its factorization.

31145021531256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297709230478 (or 1297709230474 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

Adding to 31145021531256 its reverse (65213512054113), we get a palindrome (96358533585369).

The spelling of 31145021531256 in words is "thirty-one trillion, one hundred forty-five billion, twenty-one million, five hundred thirty-one thousand, two hundred fifty-six".