25440131 has 4 divisors (see below), whose sum is σ = 26060664. Its totient is φ = 24819600.

The previous prime is 25440091. The next prime is 25440167. The reversal of 25440131 is 13104452.

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 25440131 - 2⁶ = 25440067 is a prime.

It is a super-2 number, since 2×25440131² = 1294400530594322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310205 + ... + 310286.

It is an arithmetic number, because the mean of its divisors is an integer number (6515166).

Almost surely, 2^25440131 is an apocalyptic number.

25440131 is a deficient number, since it is larger than the sum of its proper divisors (620533).

25440131 is an equidigital number, since it uses as much as digits as its factorization.

25440131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620532.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25440131 is about 5043.8210713704. The cubic root of 25440131 is about 294.1077358252.

Adding to 25440131 its reverse (13104452), we get a palindrome (38544583).

The spelling of 25440131 in words is "twenty-five million, four hundred forty thousand, one hundred thirty-one".