25802531 has 2 divisors, whose sum is σ = 25802532. Its totient is φ = 25802530.

The previous prime is 25802521. The next prime is 25802561. The reversal of 25802531 is 13520852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25802531 - 2¹⁰ = 25801507 is a prime.

It is a super-2 number, since 2×25802531² = 1331541212011922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25802531.

It is not a weakly prime, because it can be changed into another prime (25802521) 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 as a sum of consecutive naturals, namely, 12901265 + 12901266.

It is an arithmetic number, because the mean of its divisors is an integer number (12901266).

Almost surely, 2^25802531 is an apocalyptic number.

25802531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25802531 is an equidigital number, since it uses as much as digits as its factorization.

25802531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 25802531 is about 5079.6191786393. The cubic root of 25802531 is about 295.4976985877.

The spelling of 25802531 in words is "twenty-five million, eight hundred two thousand, five hundred thirty-one".