25439131 has 4 divisors (see below), whose sum is σ = 25586352. Its totient is φ = 25291912.

The previous prime is 25439111. The next prime is 25439149. The reversal of 25439131 is 13193452.

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 25439131 - 2⁹ = 25438619 is a prime.

It is a super-2 number, since 2×25439131² = 1294298772070322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25439131.

It is not an unprimeable number, because it can be changed into a prime (25439111) 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, 73351 + ... + 73696.

It is an arithmetic number, because the mean of its divisors is an integer number (6396588).

Almost surely, 2^25439131 is an apocalyptic number.

25439131 is a deficient number, since it is larger than the sum of its proper divisors (147221).

25439131 is a wasteful number, since it uses less digits than its factorization.

25439131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147220.

The product of its digits is 3240, while the sum is 28.

The square root of 25439131 is about 5043.7219392032. The cubic root of 25439131 is about 294.1038821817.

The spelling of 25439131 in words is "twenty-five million, four hundred thirty-nine thousand, one hundred thirty-one".