79217161 has 4 divisors (see below), whose sum is σ = 83877012. Its totient is φ = 74557312.

The previous prime is 79217153. The next prime is 79217179. The reversal of 79217161 is 16171297.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32718400 + 46498761 = 5720^2 + 6819^2 .

It is a cyclic number.

It is not a de Polignac number, because 79217161 - 2³ = 79217153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79217261) 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, 2329900 + ... + 2329933.

It is an arithmetic number, because the mean of its divisors is an integer number (20969253).

Almost surely, 2^79217161 is an apocalyptic number.

It is an amenable number.

79217161 is a deficient number, since it is larger than the sum of its proper divisors (4659851).

79217161 is a wasteful number, since it uses less digits than its factorization.

79217161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659850.

The product of its digits is 5292, while the sum is 34.

The square root of 79217161 is about 8900.4022942786. The cubic root of 79217161 is about 429.4768489037.

The spelling of 79217161 in words is "seventy-nine million, two hundred seventeen thousand, one hundred sixty-one".