79911997 has 4 divisors (see below), whose sum is σ = 87176736. Its totient is φ = 72647260.

The previous prime is 79911983. The next prime is 79912003.

79911997 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79911997 - 2⁷ = 79911869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79911947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3632353 + ... + 3632374.

It is an arithmetic number, because the mean of its divisors is an integer number (21794184).

Almost surely, 2^79911997 is an apocalyptic number.

It is an amenable number.

79911997 is a deficient number, since it is larger than the sum of its proper divisors (7264739).

79911997 is a wasteful number, since it uses less digits than its factorization.

79911997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264738.

The product of its digits is 321489, while the sum is 52.

The square root of 79911997 is about 8939.3510390856. The cubic root of 79911997 is about 430.7288827733.

It can be divided in two parts, 79911 and 997, that added together give a palindrome (80908).

The spelling of 79911997 in words is "seventy-nine million, nine hundred eleven thousand, nine hundred ninety-seven".