79792121 has 4 divisors (see below), whose sum is σ = 80582244. Its totient is φ = 79002000.

The previous prime is 79792093. The next prime is 79792127. The reversal of 79792121 is 12129797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12129797 = 101 ⋅120097.

It can be written as a sum of positive squares in 2 ways, for example, as 55428025 + 24364096 = 7445^2 + 4936^2 .

It is a cyclic number.

It is not a de Polignac number, because 79792121 - 2⁶ = 79792057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79792127) 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, 394910 + ... + 395111.

It is an arithmetic number, because the mean of its divisors is an integer number (20145561).

Almost surely, 2^79792121 is an apocalyptic number.

It is an amenable number.

79792121 is a deficient number, since it is larger than the sum of its proper divisors (790123).

79792121 is a wasteful number, since it uses less digits than its factorization.

79792121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790122.

The product of its digits is 15876, while the sum is 38.

The square root of 79792121 is about 8932.6435616787. The cubic root of 79792121 is about 430.5133961639.

The spelling of 79792121 in words is "seventy-nine million, seven hundred ninety-two thousand, one hundred twenty-one".