31256865213 has 16 divisors (see below), whose sum is σ = 48101091456. Its totient is φ = 17684222400.

The previous prime is 31256865187. The next prime is 31256865239.

31256865213 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (31256865187) and next prime (31256865239).

It is not a de Polignac number, because 31256865213 - 2⁵ = 31256865181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31256865293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7366306 + ... + 7370547.

It is an arithmetic number, because the mean of its divisors is an integer number (3006318216).

Almost surely, 2^31256865213 is an apocalyptic number.

It is an amenable number.

31256865213 is a deficient number, since it is larger than the sum of its proper divisors (16844226243).

31256865213 is a wasteful number, since it uses less digits than its factorization.

31256865213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14736964.

The product of its digits is 259200, while the sum is 42.

The spelling of 31256865213 in words is "thirty-one billion, two hundred fifty-six million, eight hundred sixty-five thousand, two hundred thirteen".