25508531 has 4 divisors (see below), whose sum is σ = 25590864. Its totient is φ = 25426200.

The previous prime is 25508521. The next prime is 25508563. The reversal of 25508531 is 13580552.

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 25508531 - 2¹⁴ = 25492147 is a prime.

It is a super-2 number, since 2×25508531² = 1301370307555922, 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 = 25508494 and 25508503.

It is not an unprimeable number, because it can be changed into a prime (25508521) 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 3 ways as a sum of consecutive naturals, for example, 40700 + ... + 41321.

It is an arithmetic number, because the mean of its divisors is an integer number (6397716).

Almost surely, 2^25508531 is an apocalyptic number.

25508531 is a deficient number, since it is larger than the sum of its proper divisors (82333).

25508531 is an equidigital number, since it uses as much as digits as its factorization.

25508531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82332.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 25508531 is about 5050.5970934138. The cubic root of 25508531 is about 294.3710857106.

The spelling of 25508531 in words is "twenty-five million, five hundred eight thousand, five hundred thirty-one".