25856531 has 4 divisors (see below), whose sum is σ = 26980752. Its totient is φ = 24732312.

The previous prime is 25856491. The next prime is 25856539. The reversal of 25856531 is 13565852.

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 25856531 - 2¹⁰ = 25855507 is a prime.

It is a super-2 number, since 2×25856531² = 1337120390707922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25856491 and 25856500.

It is not an unprimeable number, because it can be changed into a prime (25856539) 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, 562076 + ... + 562121.

It is an arithmetic number, because the mean of its divisors is an integer number (6745188).

Almost surely, 2^25856531 is an apocalyptic number.

25856531 is a deficient number, since it is larger than the sum of its proper divisors (1124221).

25856531 is a wasteful number, since it uses less digits than its factorization.

25856531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124220.

The product of its digits is 36000, while the sum is 35.

The square root of 25856531 is about 5084.9317596208. The cubic root of 25856531 is about 295.7036959120.

The spelling of 25856531 in words is "twenty-five million, eight hundred fifty-six thousand, five hundred thirty-one".