51394613 has 2 divisors, whose sum is σ = 51394614. Its totient is φ = 51394612.

The previous prime is 51394579. The next prime is 51394633. The reversal of 51394613 is 31649315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43059844 + 8334769 = 6562^2 + 2887^2 .

It is a cyclic number.

It is not a de Polignac number, because 51394613 - 2²⁴ = 34617397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51394613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51394633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25697306 + 25697307.

It is an arithmetic number, because the mean of its divisors is an integer number (25697307).

Almost surely, 2^51394613 is an apocalyptic number.

It is an amenable number.

51394613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51394613 is an equidigital number, since it uses as much as digits as its factorization.

51394613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 51394613 is about 7169.0036267253. The cubic root of 51394613 is about 371.7969876419.

The spelling of 51394613 in words is "fifty-one million, three hundred ninety-four thousand, six hundred thirteen".