79982121 has 8 divisors (see below), whose sum is σ = 108234784. Its totient is φ = 52525440.

The previous prime is 79982101. The next prime is 79982137. The reversal of 79982121 is 12128997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79982121 - 2¹¹ = 79980073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79982121.

It is not an unprimeable number, because it can be changed into a prime (79982101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198760 + ... + 199161.

It is an arithmetic number, because the mean of its divisors is an integer number (13529348).

Almost surely, 2^79982121 is an apocalyptic number.

It is an amenable number.

79982121 is a deficient number, since it is larger than the sum of its proper divisors (28252663).

79982121 is a wasteful number, since it uses less digits than its factorization.

79982121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397991.

The product of its digits is 18144, while the sum is 39.

The square root of 79982121 is about 8943.2723876666. The cubic root of 79982121 is about 430.8548363333.

The spelling of 79982121 in words is "seventy-nine million, nine hundred eighty-two thousand, one hundred twenty-one".