256530115631 has 2 divisors, whose sum is σ = 256530115632. Its totient is φ = 256530115630.

The previous prime is 256530115607. The next prime is 256530115643. The reversal of 256530115631 is 136511035652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256530115631 - 2¹⁸ = 256529853487 is a prime.

It is a super-2 number, since 2×256530115631² (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 (256539115631) 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 as a sum of consecutive naturals, namely, 128265057815 + 128265057816.

It is an arithmetic number, because the mean of its divisors is an integer number (128265057816).

Almost surely, 2^256530115631 is an apocalyptic number.

256530115631 is a deficient number, since it is larger than the sum of its proper divisors (1).

256530115631 is an equidigital number, since it uses as much as digits as its factorization.

256530115631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 38.

The spelling of 256530115631 in words is "two hundred fifty-six billion, five hundred thirty million, one hundred fifteen thousand, six hundred thirty-one".