51115613 has 2 divisors, whose sum is σ = 51115614. Its totient is φ = 51115612.

The previous prime is 51115601. The next prime is 51115657. The reversal of 51115613 is 31651115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44448889 + 6666724 = 6667^2 + 2582^2 .

It is a cyclic number.

It is not a de Polignac number, because 51115613 - 2⁸ = 51115357 is a prime.

It is a super-2 number, since 2×51115613² = 5225611784731538, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51115693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557806 + 25557807.

It is an arithmetic number, because the mean of its divisors is an integer number (25557807).

Almost surely, 2^51115613 is an apocalyptic number.

It is an amenable number.

51115613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115613 is an equidigital number, since it uses as much as digits as its factorization.

51115613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 23.

The square root of 51115613 is about 7149.5183753873. The cubic root of 51115613 is about 371.1229894253.

Adding to 51115613 its reverse (31651115), we get a palindrome (82766728).

The spelling of 51115613 in words is "fifty-one million, one hundred fifteen thousand, six hundred thirteen".