51917977 has 2 divisors, whose sum is σ = 51917978. Its totient is φ = 51917976.

The previous prime is 51917959. The next prime is 51918001. The reversal of 51917977 is 77971915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43414921 + 8503056 = 6589^2 + 2916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51917977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51917927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25958988 + 25958989.

It is an arithmetic number, because the mean of its divisors is an integer number (25958989).

Almost surely, 2^51917977 is an apocalyptic number.

It is an amenable number.

51917977 is a deficient number, since it is larger than the sum of its proper divisors (1).

51917977 is an equidigital number, since it uses as much as digits as its factorization.

51917977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138915, while the sum is 46.

The square root of 51917977 is about 7205.4130346567. The cubic root of 51917977 is about 373.0547612747.

It can be divided in two parts, 519 and 17977, that added together give a square (18496 = 136²).

The spelling of 51917977 in words is "fifty-one million, nine hundred seventeen thousand, nine hundred seventy-seven".