51777697 has 2 divisors, whose sum is σ = 51777698. Its totient is φ = 51777696.

The previous prime is 51777653. The next prime is 51777703. The reversal of 51777697 is 79677715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48874081 + 2903616 = 6991^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 51777697 - 2⁷ = 51777569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51777697.

It is not a weakly prime, because it can be changed into another prime (51777197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25888848 + 25888849.

It is an arithmetic number, because the mean of its divisors is an integer number (25888849).

Almost surely, 2^51777697 is an apocalyptic number.

It is an amenable number.

51777697 is a deficient number, since it is larger than the sum of its proper divisors (1).

51777697 is an equidigital number, since it uses as much as digits as its factorization.

51777697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648270, while the sum is 49.

The square root of 51777697 is about 7195.6721020347. The cubic root of 51777697 is about 372.7184659052.

The spelling of 51777697 in words is "fifty-one million, seven hundred seventy-seven thousand, six hundred ninety-seven".