77149973 has 2 divisors, whose sum is σ = 77149974. Its totient is φ = 77149972.

The previous prime is 77149913. The next prime is 77149999. The reversal of 77149973 is 37994177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77035729 + 114244 = 8777^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 77149973 - 2⁸ = 77149717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77149903) 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, 38574986 + 38574987.

It is an arithmetic number, because the mean of its divisors is an integer number (38574987).

Almost surely, 2^77149973 is an apocalyptic number.

It is an amenable number.

77149973 is a deficient number, since it is larger than the sum of its proper divisors (1).

77149973 is an equidigital number, since it uses as much as digits as its factorization.

77149973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 333396, while the sum is 47.

The square root of 77149973 is about 8783.5057351834. The cubic root of 77149973 is about 425.7081122596.

The spelling of 77149973 in words is "seventy-seven million, one hundred forty-nine thousand, nine hundred seventy-three".