25538013 has 6 divisors (see below), whose sum is σ = 36888254. Its totient is φ = 17025336.

The previous prime is 25538003. The next prime is 25538059. The reversal of 25538013 is 31083552.

It can be written as a sum of positive squares in only one way, i.e., 24980004 + 558009 = 4998^2 + 747^2 .

It is not a de Polignac number, because 25538013 - 2⁶ = 25537949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25538003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1418770 + ... + 1418787.

Almost surely, 2^25538013 is an apocalyptic number.

It is an amenable number.

25538013 is a deficient number, since it is larger than the sum of its proper divisors (11350241).

25538013 is a wasteful number, since it uses less digits than its factorization.

25538013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837563 (or 2837560 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25538013 is about 5053.5149153832. The cubic root of 25538013 is about 294.4844504902.

The spelling of 25538013 in words is "twenty-five million, five hundred thirty-eight thousand, thirteen".