51328913 has 2 divisors, whose sum is σ = 51328914. Its totient is φ = 51328912.

The previous prime is 51328897. The next prime is 51328919. The reversal of 51328913 is 31982315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48678529 + 2650384 = 6977^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 51328913 - 2⁴ = 51328897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51328913.

It is not a weakly prime, because it can be changed into another prime (51328919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25664456 + 25664457.

It is an arithmetic number, because the mean of its divisors is an integer number (25664457).

Almost surely, 2^51328913 is an apocalyptic number.

It is an amenable number.

51328913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51328913 is an equidigital number, since it uses as much as digits as its factorization.

51328913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 51328913 is about 7164.4199346493. The cubic root of 51328913 is about 371.6384919243.

The spelling of 51328913 in words is "fifty-one million, three hundred twenty-eight thousand, nine hundred thirteen".