25552399 has 2 divisors, whose sum is σ = 25552400. Its totient is φ = 25552398.

The previous prime is 25552367. The next prime is 25552427. The reversal of 25552399 is 99325552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25552399 - 2⁵ = 25552367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25552099) 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, 12776199 + 12776200.

It is an arithmetic number, because the mean of its divisors is an integer number (12776200).

Almost surely, 2^25552399 is an apocalyptic number.

25552399 is a deficient number, since it is larger than the sum of its proper divisors (1).

25552399 is an equidigital number, since it uses as much as digits as its factorization.

25552399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121500, while the sum is 40.

The square root of 25552399 is about 5054.9380807286. The cubic root of 25552399 is about 294.5397361548.

The spelling of 25552399 in words is "twenty-five million, five hundred fifty-two thousand, three hundred ninety-nine".