25129131 has 4 divisors (see below), whose sum is σ = 33505512. Its totient is φ = 16752752.

The previous prime is 25129129. The next prime is 25129151. The reversal of 25129131 is 13192152.

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 25129131 - 2¹ = 25129129 is a prime.

It is a super-2 number, since 2×25129131² = 1262946449630322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25129121) 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, 4188186 + ... + 4188191.

It is an arithmetic number, because the mean of its divisors is an integer number (8376378).

Almost surely, 2^25129131 is an apocalyptic number.

25129131 is a deficient number, since it is larger than the sum of its proper divisors (8376381).

25129131 is an equidigital number, since it uses as much as digits as its factorization.

25129131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8376380.

The product of its digits is 540, while the sum is 24.

The square root of 25129131 is about 5012.8964681110. The cubic root of 25129131 is about 292.9043512803.

The spelling of 25129131 in words is "twenty-five million, one hundred twenty-nine thousand, one hundred thirty-one".