79961911 has 4 divisors (see below), whose sum is σ = 81272824. Its totient is φ = 78651000.

The previous prime is 79961891. The next prime is 79961923. The reversal of 79961911 is 11916997.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79961911 - 2⁵ = 79961879 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 (79961941) 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, 655365 + ... + 655486.

It is an arithmetic number, because the mean of its divisors is an integer number (20318206).

Almost surely, 2^79961911 is an apocalyptic number.

79961911 is a deficient number, since it is larger than the sum of its proper divisors (1310913).

79961911 is a wasteful number, since it uses less digits than its factorization.

79961911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310912.

The product of its digits is 30618, while the sum is 43.

The square root of 79961911 is about 8942.1424166695. The cubic root of 79961911 is about 430.8185435983.

The spelling of 79961911 in words is "seventy-nine million, nine hundred sixty-one thousand, nine hundred eleven".