25128113 has 4 divisors (see below), whose sum is σ = 25156608. Its totient is φ = 25099620.

The previous prime is 25128109. The next prime is 25128119. The reversal of 25128113 is 31182152.

It is a happy number.

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 25128113 - 2² = 25128109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25128119) 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, 12881 + ... + 14702.

It is an arithmetic number, because the mean of its divisors is an integer number (6289152).

Almost surely, 2^25128113 is an apocalyptic number.

It is an amenable number.

25128113 is a deficient number, since it is larger than the sum of its proper divisors (28495).

25128113 is an equidigital number, since it uses as much as digits as its factorization.

25128113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28494.

The product of its digits is 480, while the sum is 23.

The square root of 25128113 is about 5012.7949289792. The cubic root of 25128113 is about 292.9003959684.

The spelling of 25128113 in words is "twenty-five million, one hundred twenty-eight thousand, one hundred thirteen".