79612121 has 4 divisors (see below), whose sum is σ = 80702772. Its totient is φ = 78521472.

The previous prime is 79612103. The next prime is 79612129. The reversal of 79612121 is 12121697.

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 34386496 + 45225625 = 5864^2 + 6725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79612121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79612129) 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, 545216 + ... + 545361.

It is an arithmetic number, because the mean of its divisors is an integer number (20175693).

Almost surely, 2^79612121 is an apocalyptic number.

It is an amenable number.

79612121 is a deficient number, since it is larger than the sum of its proper divisors (1090651).

79612121 is a wasteful number, since it uses less digits than its factorization.

79612121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090650.

The product of its digits is 1512, while the sum is 29.

The square root of 79612121 is about 8922.5624682599. The cubic root of 79612121 is about 430.1894261854.

The spelling of 79612121 in words is "seventy-nine million, six hundred twelve thousand, one hundred twenty-one".