25312139 has 4 divisors (see below), whose sum is σ = 25668720. Its totient is φ = 24955560.

The previous prime is 25312117. The next prime is 25312141. The reversal of 25312139 is 93121352.

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

It is a cyclic number.

It is not a de Polignac number, because 25312139 - 2²⁰ = 24263563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25312109) 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, 178184 + ... + 178325.

It is an arithmetic number, because the mean of its divisors is an integer number (6417180).

Almost surely, 2^25312139 is an apocalyptic number.

25312139 is a deficient number, since it is larger than the sum of its proper divisors (356581).

25312139 is an equidigital number, since it uses as much as digits as its factorization.

25312139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356580.

The product of its digits is 1620, while the sum is 26.

The square root of 25312139 is about 5031.1170727782. The cubic root of 25312139 is about 293.6136772616.

The spelling of 25312139 in words is "twenty-five million, three hundred twelve thousand, one hundred thirty-nine".