25133813 has 4 divisors (see below), whose sum is σ = 25144140. Its totient is φ = 25123488.

The previous prime is 25133809. The next prime is 25133821. The reversal of 25133813 is 31833152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1387684 + 23746129 = 1178^2 + 4873^2 .

It is a cyclic number.

It is not a de Polignac number, because 25133813 - 2² = 25133809 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 (25133893) 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, 731 + ... + 7127.

It is an arithmetic number, because the mean of its divisors is an integer number (6286035).

Almost surely, 2^25133813 is an apocalyptic number.

It is an amenable number.

25133813 is a deficient number, since it is larger than the sum of its proper divisors (10327).

25133813 is an equidigital number, since it uses as much as digits as its factorization.

25133813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10326.

The product of its digits is 2160, while the sum is 26.

The square root of 25133813 is about 5013.3634418422. The cubic root of 25133813 is about 292.9225412316.

Adding to 25133813 its reverse (31833152), we get a palindrome (56966965).

The spelling of 25133813 in words is "twenty-five million, one hundred thirty-three thousand, eight hundred thirteen".