25135539 has 24 divisors (see below), whose sum is σ = 39598272. Its totient is φ = 14058720.

The previous prime is 25135529. The next prime is 25135541. The reversal of 25135539 is 93553152.

It is not a de Polignac number, because 25135539 - 2⁸ = 25135283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (25135529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3324 + ... + 7830.

It is an arithmetic number, because the mean of its divisors is an integer number (1649928).

Almost surely, 2^25135539 is an apocalyptic number.

25135539 is a deficient number, since it is larger than the sum of its proper divisors (14462733).

25135539 is a wasteful number, since it uses less digits than its factorization.

25135539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547 (or 4534 counting only the distinct ones).

The product of its digits is 20250, while the sum is 33.

The square root of 25135539 is about 5013.5355788106. The cubic root of 25135539 is about 292.9292463123.

The spelling of 25135539 in words is "twenty-five million, one hundred thirty-five thousand, five hundred thirty-nine".