31251253064 has 32 divisors (see below), whose sum is σ = 61610398200. Its totient is φ = 14839480320.

The previous prime is 31251253049. The next prime is 31251253069. The reversal of 31251253064 is 46035215213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11586800164 + 19664452900 = 107642^2 + 140230^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31251253064.

It is not an unprimeable number, because it can be changed into a prime (31251253069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089977 + ... + 1118280.

Almost surely, 2^31251253064 is an apocalyptic number.

It is an amenable number.

31251253064 is a deficient number, since it is larger than the sum of its proper divisors (30359145136).

31251253064 is a wasteful number, since it uses less digits than its factorization.

31251253064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208353 (or 2208349 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 31251253064 its reverse (46035215213), we get a palindrome (77286468277).

The spelling of 31251253064 in words is "thirty-one billion, two hundred fifty-one million, two hundred fifty-three thousand, sixty-four".