25609959 has 8 divisors (see below), whose sum is σ = 37940720. Its totient is φ = 17073288.

The previous prime is 25609949. The next prime is 25609979. The reversal of 25609959 is 95990652.

It is a de Polignac number, because none of the positive numbers 2^k-25609959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25609949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474232 + ... + 474285.

It is an arithmetic number, because the mean of its divisors is an integer number (4742590).

Almost surely, 2^25609959 is an apocalyptic number.

25609959 is a deficient number, since it is larger than the sum of its proper divisors (12330761).

25609959 is an equidigital number, since it uses as much as digits as its factorization.

25609959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948526 (or 948520 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 25609959 is about 5060.6283206732. The cubic root of 25609959 is about 294.7607329257.

The spelling of 25609959 in words is "twenty-five million, six hundred nine thousand, nine hundred fifty-nine".