25212431 has 4 divisors (see below), whose sum is σ = 25237872. Its totient is φ = 25186992.

The previous prime is 25212413. The next prime is 25212433. The reversal of 25212431 is 13421252.

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 25212431 - 2⁶ = 25212367 is a prime.

It is a super-2 number, since 2×25212431² = 1271333353859522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25212433) 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, 11171 + ... + 13236.

It is an arithmetic number, because the mean of its divisors is an integer number (6309468).

Almost surely, 2^25212431 is an apocalyptic number.

25212431 is a deficient number, since it is larger than the sum of its proper divisors (25441).

25212431 is a wasteful number, since it uses less digits than its factorization.

25212431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25440.

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

The square root of 25212431 is about 5021.1981637852. The cubic root of 25212431 is about 293.2276417033.

Adding to 25212431 its reverse (13421252), we get a palindrome (38633683).

The spelling of 25212431 in words is "twenty-five million, two hundred twelve thousand, four hundred thirty-one".