51316913 has 2 divisors, whose sum is σ = 51316914. Its totient is φ = 51316912.

The previous prime is 51316877. The next prime is 51316919. The reversal of 51316913 is 31961315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47224384 + 4092529 = 6872^2 + 2023^2 .

It is a cyclic number.

It is not a de Polignac number, because 51316913 - 2⁶ = 51316849 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 (51316919) 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, 25658456 + 25658457.

It is an arithmetic number, because the mean of its divisors is an integer number (25658457).

Almost surely, 2^51316913 is an apocalyptic number.

It is an amenable number.

51316913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51316913 is an equidigital number, since it uses as much as digits as its factorization.

51316913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 51316913 is about 7163.5824138485. The cubic root of 51316913 is about 371.6095283296.

The spelling of 51316913 in words is "fifty-one million, three hundred sixteen thousand, nine hundred thirteen".