256539115631 has 2 divisors, whose sum is σ = 256539115632. Its totient is φ = 256539115630.

The previous prime is 256539115603. The next prime is 256539115649. The reversal of 256539115631 is 136511935652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256539115631 - 2¹⁰ = 256539114607 is a prime.

It is a super-2 number, since 2×256539115631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256539115601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128269557815 + 128269557816.

It is an arithmetic number, because the mean of its divisors is an integer number (128269557816).

Almost surely, 2^256539115631 is an apocalyptic number.

256539115631 is a deficient number, since it is larger than the sum of its proper divisors (1).

256539115631 is an equidigital number, since it uses as much as digits as its factorization.

256539115631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729000, while the sum is 47.

The spelling of 256539115631 in words is "two hundred fifty-six billion, five hundred thirty-nine million, one hundred fifteen thousand, six hundred thirty-one".