256410531 has 24 divisors (see below), whose sum is σ = 400392720. Its totient is φ = 157185216.

The previous prime is 256410527. The next prime is 256410571. The reversal of 256410531 is 135014652.

It is not a de Polignac number, because 256410531 - 2² = 256410527 is a prime.

It is a super-2 number, since 2×256410531² = 131492720815403922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256410495 and 256410504.

It is not an unprimeable number, because it can be changed into a prime (256410571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27400 + ... + 35546.

It is an arithmetic number, because the mean of its divisors is an integer number (16683030).

Almost surely, 2^256410531 is an apocalyptic number.

256410531 is a deficient number, since it is larger than the sum of its proper divisors (143982189).

256410531 is a wasteful number, since it uses less digits than its factorization.

256410531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435 (or 8432 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 256410531 is about 16012.8239545684. The cubic root of 256410531 is about 635.2996547977.

The spelling of 256410531 in words is "two hundred fifty-six million, four hundred ten thousand, five hundred thirty-one".