25312643 has 6 divisors (see below), whose sum is σ = 26889516. Its totient is φ = 23823392.

The previous prime is 25312613. The next prime is 25312687. The reversal of 25312643 is 34621352.

It is not a de Polignac number, because 25312643 - 2⁸ = 25312387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25312603) 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 5 ways as a sum of consecutive naturals, for example, 43505 + ... + 44082.

It is an arithmetic number, because the mean of its divisors is an integer number (4481586).

Almost surely, 2^25312643 is an apocalyptic number.

25312643 is a deficient number, since it is larger than the sum of its proper divisors (1576873).

25312643 is an equidigital number, since it uses as much as digits as its factorization.

25312643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87621 (or 87604 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 25312643 is about 5031.1671608087. The cubic root of 25312643 is about 293.6156260013.

Adding to 25312643 its reverse (34621352), we get a palindrome (59933995).

The spelling of 25312643 in words is "twenty-five million, three hundred twelve thousand, six hundred forty-three".