25131539 has 4 divisors (see below), whose sum is σ = 25354056. Its totient is φ = 24909024.

The previous prime is 25131529. The next prime is 25131541. The reversal of 25131539 is 93513152.

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 25131539 - 2⁴ = 25131523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25131529) 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, 111089 + ... + 111314.

It is an arithmetic number, because the mean of its divisors is an integer number (6338514).

Almost surely, 2^25131539 is an apocalyptic number.

25131539 is a deficient number, since it is larger than the sum of its proper divisors (222517).

25131539 is a wasteful number, since it uses less digits than its factorization.

25131539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222516.

The product of its digits is 4050, while the sum is 29.

The square root of 25131539 is about 5013.1366428614. The cubic root of 25131539 is about 292.9137068386.

The spelling of 25131539 in words is "twenty-five million, one hundred thirty-one thousand, five hundred thirty-nine".