79977173 has 2 divisors, whose sum is σ = 79977174. Its totient is φ = 79977172.

The previous prime is 79977113. The next prime is 79977181. The reversal of 79977173 is 37177997.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49252324 + 30724849 = 7018^2 + 5543^2 .

It is a cyclic number.

It is not a de Polignac number, because 79977173 - 2⁶ = 79977109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79977103) 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, 39988586 + 39988587.

It is an arithmetic number, because the mean of its divisors is an integer number (39988587).

Almost surely, 2^79977173 is an apocalyptic number.

It is an amenable number.

79977173 is a deficient number, since it is larger than the sum of its proper divisors (1).

79977173 is an equidigital number, since it uses as much as digits as its factorization.

79977173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583443, while the sum is 50.

The square root of 79977173 is about 8942.9957508656. The cubic root of 79977173 is about 430.8459513739.

The spelling of 79977173 in words is "seventy-nine million, nine hundred seventy-seven thousand, one hundred seventy-three".