25440531 has 4 divisors (see below), whose sum is σ = 33920712. Its totient is φ = 16960352.

The previous prime is 25440529. The next prime is 25440533. The reversal of 25440531 is 13504452.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25440529) and next prime (25440533).

It is a cyclic number.

It is not a de Polignac number, because 25440531 - 2¹ = 25440529 is a prime.

It is a super-2 number, since 2×25440531² = 1294441235123922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25440533) 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, 4240086 + ... + 4240091.

It is an arithmetic number, because the mean of its divisors is an integer number (8480178).

Almost surely, 2^25440531 is an apocalyptic number.

25440531 is a deficient number, since it is larger than the sum of its proper divisors (8480181).

25440531 is an equidigital number, since it uses as much as digits as its factorization.

25440531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8480180.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 25440531 is about 5043.8607236917. The cubic root of 25440531 is about 294.1092772544.

Adding to 25440531 its reverse (13504452), we get a palindrome (38944983).

The spelling of 25440531 in words is "twenty-five million, four hundred forty thousand, five hundred thirty-one".