51332513 has 2 divisors, whose sum is σ = 51332514. Its totient is φ = 51332512.

The previous prime is 51332467. The next prime is 51332551. The reversal of 51332513 is 31523315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39853969 + 11478544 = 6313^2 + 3388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51332513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51331513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25666256 + 25666257.

It is an arithmetic number, because the mean of its divisors is an integer number (25666257).

Almost surely, 2^51332513 is an apocalyptic number.

It is an amenable number.

51332513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51332513 is an equidigital number, since it uses as much as digits as its factorization.

51332513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 23.

The square root of 51332513 is about 7164.6711717985. The cubic root of 51332513 is about 371.6471801224.

Adding to 51332513 its reverse (31523315), we get a palindrome (82855828).

The spelling of 51332513 in words is "fifty-one million, three hundred thirty-two thousand, five hundred thirteen".