25315813 has 4 divisors (see below), whose sum is σ = 25373920. Its totient is φ = 25257708.

The previous prime is 25315781. The next prime is 25315817. The reversal of 25315813 is 31851352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25315813 - 2⁵ = 25315781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25315817) 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, 28395 + ... + 29272.

It is an arithmetic number, because the mean of its divisors is an integer number (6343480).

Almost surely, 2^25315813 is an apocalyptic number.

It is an amenable number.

25315813 is a deficient number, since it is larger than the sum of its proper divisors (58107).

25315813 is an equidigital number, since it uses as much as digits as its factorization.

25315813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58106.

The product of its digits is 3600, while the sum is 28.

The square root of 25315813 is about 5031.4821871890. The cubic root of 25315813 is about 293.6278823624.

The spelling of 25315813 in words is "twenty-five million, three hundred fifteen thousand, eight hundred thirteen".