79717971 has 16 divisors (see below), whose sum is σ = 108573984. Its totient is φ = 52015104.

The previous prime is 79717961. The next prime is 79717993. The reversal of 79717971 is 17971797.

It is not a de Polignac number, because 79717971 - 2⁶ = 79717907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79717971.

It is not an unprimeable number, because it can be changed into a prime (79717961) 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 in 15 ways as a sum of consecutive naturals, for example, 28675 + ... + 31331.

It is an arithmetic number, because the mean of its divisors is an integer number (6785874).

Almost surely, 2^79717971 is an apocalyptic number.

79717971 is a deficient number, since it is larger than the sum of its proper divisors (28856013).

79717971 is a wasteful number, since it uses less digits than its factorization.

79717971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870.

The product of its digits is 194481, while the sum is 48.

The square root of 79717971 is about 8928.4920899332. The cubic root of 79717971 is about 430.3799976050.

The spelling of 79717971 in words is "seventy-nine million, seven hundred seventeen thousand, nine hundred seventy-one".