77051977 has 2 divisors, whose sum is σ = 77051978. Its totient is φ = 77051976.

The previous prime is 77051959. The next prime is 77051999. The reversal of 77051977 is 77915077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76457536 + 594441 = 8744^2 + 771^2 .

It is an emirp because it is prime and its reverse (77915077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77051977 is a prime.

It is not a weakly prime, because it can be changed into another prime (77051477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38525988 + 38525989.

It is an arithmetic number, because the mean of its divisors is an integer number (38525989).

Almost surely, 2^77051977 is an apocalyptic number.

It is an amenable number.

77051977 is a deficient number, since it is larger than the sum of its proper divisors (1).

77051977 is an equidigital number, since it uses as much as digits as its factorization.

77051977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108045, while the sum is 43.

The square root of 77051977 is about 8777.9255522020. The cubic root of 77051977 is about 425.5277908833.

The spelling of 77051977 in words is "seventy-seven million, fifty-one thousand, nine hundred seventy-seven".