25634891 has 2 divisors, whose sum is σ = 25634892. Its totient is φ = 25634890.

The previous prime is 25634887. The next prime is 25634897. The reversal of 25634891 is 19843652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25634891 - 2² = 25634887 is a prime.

It is not a weakly prime, because it can be changed into another prime (25634897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12817445 + 12817446.

It is an arithmetic number, because the mean of its divisors is an integer number (12817446).

Almost surely, 2^25634891 is an apocalyptic number.

25634891 is a deficient number, since it is larger than the sum of its proper divisors (1).

25634891 is an equidigital number, since it uses as much as digits as its factorization.

25634891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 25634891 is about 5063.0910519168. The cubic root of 25634891 is about 294.8563544646.

The spelling of 25634891 in words is "twenty-five million, six hundred thirty-four thousand, eight hundred ninety-one".