51372913 has 2 divisors, whose sum is σ = 51372914. Its totient is φ = 51372912.

The previous prime is 51372911. The next prime is 51372931. The reversal of 51372913 is 31927315.

Together with next prime (51372931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51022449 + 350464 = 7143^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 51372913 - 2¹ = 51372911 is a prime.

Together with 51372911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51372911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25686456 + 25686457.

It is an arithmetic number, because the mean of its divisors is an integer number (25686457).

Almost surely, 2^51372913 is an apocalyptic number.

It is an amenable number.

51372913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51372913 is an equidigital number, since it uses as much as digits as its factorization.

51372913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 31.

The square root of 51372913 is about 7167.4900069690. The cubic root of 51372913 is about 371.7446531661.

The spelling of 51372913 in words is "fifty-one million, three hundred seventy-two thousand, nine hundred thirteen".