25975531 has 2 divisors, whose sum is σ = 25975532. Its totient is φ = 25975530.

The previous prime is 25975529. The next prime is 25975549. The reversal of 25975531 is 13557952.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25975531 - 2¹ = 25975529 is a prime.

It is a super-2 number, since 2×25975531² = 1349456421463922, which contains 22 as substring.

Together with 25975529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25975501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12987765 + 12987766.

It is an arithmetic number, because the mean of its divisors is an integer number (12987766).

Almost surely, 2^25975531 is an apocalyptic number.

25975531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25975531 is an equidigital number, since it uses as much as digits as its factorization.

25975531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 37.

The square root of 25975531 is about 5096.6195659476. The cubic root of 25975531 is about 296.1566426504.

It can be divided in two parts, 2597 and 5531, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 25975531 in words is "twenty-five million, nine hundred seventy-five thousand, five hundred thirty-one".