79699121 has 8 divisors (see below), whose sum is σ = 83185704. Its totient is φ = 76286080.

The previous prime is 79699097. The next prime is 79699141. The reversal of 79699121 is 12199697.

It can be written as a sum of positive squares in 4 ways, for example, as 21390625 + 58308496 = 4625^2 + 7636^2 .

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

It is not a de Polignac number, because 79699121 - 2¹⁰ = 79698097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79699141) 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, 16166 + ... + 20511.

It is an arithmetic number, because the mean of its divisors is an integer number (10398213).

Almost surely, 2^79699121 is an apocalyptic number.

It is an amenable number.

79699121 is a deficient number, since it is larger than the sum of its proper divisors (3486583).

79699121 is a wasteful number, since it uses less digits than its factorization.

79699121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36771.

The product of its digits is 61236, while the sum is 44.

The square root of 79699121 is about 8927.4364181438. The cubic root of 79699121 is about 430.3460725800.

The spelling of 79699121 in words is "seventy-nine million, six hundred ninety-nine thousand, one hundred twenty-one".