31257475213 has 4 divisors (see below), whose sum is σ = 31303646460. Its totient is φ = 31211303968.

The previous prime is 31257475141. The next prime is 31257475231.

It is a happy number.

31257475213 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28519778884 + 2737696329 = 168878^2 + 52323^2 .

It is a cyclic number.

It is not a de Polignac number, because 31257475213 - 2⁹ = 31257474701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31257475013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23084608 + ... + 23085961.

It is an arithmetic number, because the mean of its divisors is an integer number (7825911615).

Almost surely, 2^31257475213 is an apocalyptic number.

It is an amenable number.

31257475213 is a deficient number, since it is larger than the sum of its proper divisors (46171247).

31257475213 is an equidigital number, since it uses as much as digits as its factorization.

31257475213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46171246.

The product of its digits is 176400, while the sum is 40.

The spelling of 31257475213 in words is "thirty-one billion, two hundred fifty-seven million, four hundred seventy-five thousand, two hundred thirteen".