25204391 has 2 divisors, whose sum is σ = 25204392. Its totient is φ = 25204390.

The previous prime is 25204379. The next prime is 25204411. The reversal of 25204391 is 19340252.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25204391 is a prime.

It is a super-2 number, since 2×25204391² = 1270522651361762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25204391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25204351) 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, 12602195 + 12602196.

It is an arithmetic number, because the mean of its divisors is an integer number (12602196).

Almost surely, 2^25204391 is an apocalyptic number.

25204391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25204391 is an equidigital number, since it uses as much as digits as its factorization.

25204391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25204391 is about 5020.3974942229. The cubic root of 25204391 is about 293.1964692381.

The spelling of 25204391 in words is "twenty-five million, two hundred four thousand, three hundred ninety-one".