25135813 has 2 divisors, whose sum is σ = 25135814. Its totient is φ = 25135812.

The previous prime is 25135793. The next prime is 25135861. The reversal of 25135813 is 31853152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15194404 + 9941409 = 3898^2 + 3153^2 .

It is a cyclic number.

It is not a de Polignac number, because 25135813 - 2⁹ = 25135301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25135213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12567906 + 12567907.

It is an arithmetic number, because the mean of its divisors is an integer number (12567907).

Almost surely, 2^25135813 is an apocalyptic number.

It is an amenable number.

25135813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25135813 is an equidigital number, since it uses as much as digits as its factorization.

25135813 is an odious number, because the sum of its binary digits is odd.

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

The square root of 25135813 is about 5013.5629047614. The cubic root of 25135813 is about 292.9303107060.

Adding to 25135813 its reverse (31853152), we get a palindrome (56988965).

The spelling of 25135813 in words is "twenty-five million, one hundred thirty-five thousand, eight hundred thirteen".