25579013 has 4 divisors (see below), whose sum is σ = 26691168. Its totient is φ = 24466860.

The previous prime is 25579009. The next prime is 25579031. The reversal of 25579013 is 31097552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25579013 - 2² = 25579009 is a prime.

It is a super-4 number, since 4×25579013⁴ (a number of 31 digits) contains 4444 as substring.

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 (25579003) 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, 556043 + ... + 556088.

It is an arithmetic number, because the mean of its divisors is an integer number (6672792).

Almost surely, 2^25579013 is an apocalyptic number.

25579013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25579013 is a deficient number, since it is larger than the sum of its proper divisors (1112155).

25579013 is a wasteful number, since it uses less digits than its factorization.

25579013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112154.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 25579013 is about 5057.5698709954. The cubic root of 25579013 is about 294.6419595715.

The spelling of 25579013 in words is "twenty-five million, five hundred seventy-nine thousand, thirteen".