51777613 has 2 divisors, whose sum is σ = 51777614. Its totient is φ = 51777612.

The previous prime is 51777601. The next prime is 51777653. The reversal of 51777613 is 31677715.

It is a happy number.

51777613 is nontrivially palindromic in base 3.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50722884 + 1054729 = 7122^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 51777613 - 2⁵ = 51777581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51777653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25888806 + 25888807.

It is an arithmetic number, because the mean of its divisors is an integer number (25888807).

Almost surely, 2^51777613 is an apocalyptic number.

It is an amenable number.

51777613 is a deficient number, since it is larger than the sum of its proper divisors (1).

51777613 is an equidigital number, since it uses as much as digits as its factorization.

51777613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870, while the sum is 37.

The square root of 51777613 is about 7195.6662651905. Note that the first 3 decimals coincide. The cubic root of 51777613 is about 372.7182643488.

The spelling of 51777613 in words is "fifty-one million, seven hundred seventy-seven thousand, six hundred thirteen".