25660531 has 16 divisors (see below), whose sum is σ = 29713824. Its totient is φ = 21947904.

The previous prime is 25660519. The next prime is 25660541. The reversal of 25660531 is 13506652.

It is a cyclic number.

It is not a de Polignac number, because 25660531 - 2⁷ = 25660403 is a prime.

It is a super-2 number, since 2×25660531² = 1316925702403922, which contains 22 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 25660531.

It is not an unprimeable number, because it can be changed into a prime (25660501) 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 15 ways as a sum of consecutive naturals, for example, 13941 + ... + 15673.

It is an arithmetic number, because the mean of its divisors is an integer number (1857114).

Almost surely, 2^25660531 is an apocalyptic number.

25660531 is a deficient number, since it is larger than the sum of its proper divisors (4053293).

25660531 is a wasteful number, since it uses less digits than its factorization.

25660531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25660531 is about 5065.6224691542. The cubic root of 25660531 is about 294.9546267475.

The spelling of 25660531 in words is "twenty-five million, six hundred sixty thousand, five hundred thirty-one".