25641899 has 16 divisors (see below), whose sum is σ = 28033920. Its totient is φ = 23362560.

The previous prime is 25641871. The next prime is 25641911. The reversal of 25641899 is 99814652.

It is a cyclic number.

It is not a de Polignac number, because 25641899 - 2⁸ = 25641643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25641839) 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 in 15 ways as a sum of consecutive naturals, for example, 81767 + ... + 82079.

It is an arithmetic number, because the mean of its divisors is an integer number (1752120).

Almost surely, 2^25641899 is an apocalyptic number.

25641899 is a deficient number, since it is larger than the sum of its proper divisors (2392021).

25641899 is a wasteful number, since it uses less digits than its factorization.

25641899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470.

The product of its digits is 155520, while the sum is 44.

The square root of 25641899 is about 5063.7830719730. The cubic root of 25641899 is about 294.8832210382.

The spelling of 25641899 in words is "twenty-five million, six hundred forty-one thousand, eight hundred ninety-nine".