25613409 has 16 divisors (see below), whose sum is σ = 36472320. Its totient is φ = 15953280.

The previous prime is 25613381. The next prime is 25613411. The reversal of 25613409 is 90431652.

It is not a de Polignac number, because 25613409 - 2⁵ = 25613377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25613429) 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 in 15 ways as a sum of consecutive naturals, for example, 2052 + ... + 7445.

It is an arithmetic number, because the mean of its divisors is an integer number (2279520).

Almost surely, 2^25613409 is an apocalyptic number.

25613409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25613409 is a deficient number, since it is larger than the sum of its proper divisors (10858911).

25613409 is a wasteful number, since it uses less digits than its factorization.

25613409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 25613409 is about 5060.9691759583. The cubic root of 25613409 is about 294.7739683870.

The spelling of 25613409 in words is "twenty-five million, six hundred thirteen thousand, four hundred nine".