25656531 has 4 divisors (see below), whose sum is σ = 34208712. Its totient is φ = 17104352.

The previous prime is 25656487. The next prime is 25656541. The reversal of 25656531 is 13565652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25656531 - 2⁹ = 25656019 is a prime.

It is a super-2 number, since 2×25656531² = 1316515165907922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25656492 and 25656501.

It is not an unprimeable number, because it can be changed into a prime (25656541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4276086 + ... + 4276091.

It is an arithmetic number, because the mean of its divisors is an integer number (8552178).

Almost surely, 2^25656531 is an apocalyptic number.

25656531 is a deficient number, since it is larger than the sum of its proper divisors (8552181).

25656531 is an equidigital number, since it uses as much as digits as its factorization.

25656531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8552180.

The product of its digits is 27000, while the sum is 33.

The square root of 25656531 is about 5065.2276355560. The cubic root of 25656531 is about 294.9392999692.

The spelling of 25656531 in words is "twenty-five million, six hundred fifty-six thousand, five hundred thirty-one".