25585531 has 4 divisors (see below), whose sum is σ = 26129952. Its totient is φ = 25041112.

The previous prime is 25585523. The next prime is 25585543. The reversal of 25585531 is 13558552.

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 25585531 - 2³ = 25585523 is a prime.

It is a super-2 number, since 2×25585531² = 1309238793103922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25585831) 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, 272140 + ... + 272233.

It is an arithmetic number, because the mean of its divisors is an integer number (6532488).

Almost surely, 2^25585531 is an apocalyptic number.

25585531 is a deficient number, since it is larger than the sum of its proper divisors (544421).

25585531 is an equidigital number, since it uses as much as digits as its factorization.

25585531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544420.

The product of its digits is 30000, while the sum is 34.

The square root of 25585531 is about 5058.2142105688. The cubic root of 25585531 is about 294.6669841648. Note that the first 3 decimals are identical.

The spelling of 25585531 in words is "twenty-five million, five hundred eighty-five thousand, five hundred thirty-one".