25629913 has 4 divisors (see below), whose sum is σ = 25656228. Its totient is φ = 25603600.

The previous prime is 25629907. The next prime is 25629973. The reversal of 25629913 is 31992652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5631129 + 19998784 = 2373^2 + 4472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25629913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25629973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11638 + ... + 13663.

It is an arithmetic number, because the mean of its divisors is an integer number (6414057).

It is a Poulet number, since it divides 2^25629912-1.

Almost surely, 2^25629913 is an apocalyptic number.

It is an amenable number.

25629913 is a deficient number, since it is larger than the sum of its proper divisors (26315).

25629913 is a wasteful number, since it uses less digits than its factorization.

25629913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26314.

The product of its digits is 29160, while the sum is 37.

The square root of 25629913 is about 5062.5994311223. The cubic root of 25629913 is about 294.8372673286.

The spelling of 25629913 in words is "twenty-five million, six hundred twenty-nine thousand, nine hundred thirteen".