256101531 has 16 divisors (see below), whose sum is σ = 400798464. Its totient is φ = 142388064.

The previous prime is 256101529. The next prime is 256101533. The reversal of 256101531 is 135101652.

It is an interprime number because it is at equal distance from previous prime (256101529) and next prime (256101533).

It is not a de Polignac number, because 256101531 - 2¹ = 256101529 is a prime.

It is a super-2 number, since 2×256101531² = 131175988361087922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256101533) 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, 164025 + ... + 165578.

It is an arithmetic number, because the mean of its divisors is an integer number (25049904).

Almost surely, 2^256101531 is an apocalyptic number.

256101531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

256101531 is a deficient number, since it is larger than the sum of its proper divisors (144696933).

256101531 is a wasteful number, since it uses less digits than its factorization.

256101531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329650.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 256101531 is about 16003.1725292206. The cubic root of 256101531 is about 635.0443526174.

The spelling of 256101531 in words is "two hundred fifty-six million, one hundred one thousand, five hundred thirty-one".