25646531 has 2 divisors, whose sum is σ = 25646532. Its totient is φ = 25646530.

The previous prime is 25646521. The next prime is 25646563. The reversal of 25646531 is 13564652.

25646531 is nontrivially palindromic in base 2.

It is an a-pointer prime, because the next prime (25646563) can be obtained adding 25646531 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25646531 - 2¹⁰ = 25645507 is a prime.

It is a super-2 number, since 2×25646531² = 1315489104667922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25646521) 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, 12823265 + 12823266.

It is an arithmetic number, because the mean of its divisors is an integer number (12823266).

Almost surely, 2^25646531 is an apocalyptic number.

25646531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646531 is an equidigital number, since it uses as much as digits as its factorization.

25646531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 25646531 is about 5064.2404168839. The cubic root of 25646531 is about 294.9009760524.

The spelling of 25646531 in words is "twenty-five million, six hundred forty-six thousand, five hundred thirty-one".