79831121 has 4 divisors (see below), whose sum is σ = 80924772. Its totient is φ = 78737472.

The previous prime is 79831109. The next prime is 79831151. The reversal of 79831121 is 12113897.

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 16851025 + 62980096 = 4105^2 + 7936^2 .

It is a cyclic number.

It is not a de Polignac number, because 79831121 - 2¹⁸ = 79568977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79831151) 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, 546716 + ... + 546861.

It is an arithmetic number, because the mean of its divisors is an integer number (20231193).

Almost surely, 2^79831121 is an apocalyptic number.

It is an amenable number.

79831121 is a deficient number, since it is larger than the sum of its proper divisors (1093651).

79831121 is a wasteful number, since it uses less digits than its factorization.

79831121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093650.

The product of its digits is 3024, while the sum is 32.

The square root of 79831121 is about 8934.8262993748. The cubic root of 79831121 is about 430.5835254260.

The spelling of 79831121 in words is "seventy-nine million, eight hundred thirty-one thousand, one hundred twenty-one".