51513257 has 2 divisors, whose sum is σ = 51513258. Its totient is φ = 51513256.

The previous prime is 51513229. The next prime is 51513263. The reversal of 51513257 is 75231515.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48038761 + 3474496 = 6931^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 51513257 - 2⁸ = 51513001 is a prime.

It is not a weakly prime, because it can be changed into another prime (51513857) 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 as a sum of consecutive naturals, namely, 25756628 + 25756629.

It is an arithmetic number, because the mean of its divisors is an integer number (25756629).

Almost surely, 2^51513257 is an apocalyptic number.

It is an amenable number.

51513257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51513257 is an equidigital number, since it uses as much as digits as its factorization.

51513257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5250, while the sum is 29.

The square root of 51513257 is about 7177.2736467269. The cubic root of 51513257 is about 372.0828644362.

The spelling of 51513257 in words is "fifty-one million, five hundred thirteen thousand, two hundred fifty-seven".