77130817 has 2 divisors, whose sum is σ = 77130818. Its totient is φ = 77130816.

The previous prime is 77130793. The next prime is 77130913. The reversal of 77130817 is 71803177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55591936 + 21538881 = 7456^2 + 4641^2 .

It is a cyclic number.

It is not a de Polignac number, because 77130817 - 2¹⁹ = 76606529 is a prime.

It is not a weakly prime, because it can be changed into another prime (77136817) 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, 38565408 + 38565409.

It is an arithmetic number, because the mean of its divisors is an integer number (38565409).

Almost surely, 2^77130817 is an apocalyptic number.

It is an amenable number.

77130817 is a deficient number, since it is larger than the sum of its proper divisors (1).

77130817 is an equidigital number, since it uses as much as digits as its factorization.

77130817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 77130817 is about 8782.4152145068. The cubic root of 77130817 is about 425.6728755238.

The spelling of 77130817 in words is "seventy-seven million, one hundred thirty thousand, eight hundred seventeen".