25135731 has 16 divisors (see below), whose sum is σ = 37381920. Its totient is φ = 16692480.

The previous prime is 25135723. The next prime is 25135751. The reversal of 25135731 is 13753152.

It is not a de Polignac number, because 25135731 - 2³ = 25135723 is a prime.

It is a super-2 number, since 2×25135731² = 1263609945808722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 25135695 and 25135704.

It is not an unprimeable number, because it can be changed into a prime (25135751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5931 + ... + 9243.

It is an arithmetic number, because the mean of its divisors is an integer number (2336370).

Almost surely, 2^25135731 is an apocalyptic number.

25135731 is a deficient number, since it is larger than the sum of its proper divisors (12246189).

25135731 is a wasteful number, since it uses less digits than its factorization.

25135731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603 (or 3597 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 25135731 is about 5013.5547269378. The cubic root of 25135731 is about 292.9299921656.

Adding to 25135731 its reverse (13753152), we get a palindrome (38888883).

The spelling of 25135731 in words is "twenty-five million, one hundred thirty-five thousand, seven hundred thirty-one".