79239121 has 4 divisors (see below), whose sum is σ = 85334452. Its totient is φ = 73143792.

The previous prime is 79239119. The next prime is 79239137. The reversal of 79239121 is 12193297.

It is a happy number.

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 51265600 + 27973521 = 7160^2 + 5289^2 .

It is a cyclic number.

It is not a de Polignac number, because 79239121 - 2¹ = 79239119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79239421) 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, 3047646 + ... + 3047671.

It is an arithmetic number, because the mean of its divisors is an integer number (21333613).

Almost surely, 2^79239121 is an apocalyptic number.

It is an amenable number.

79239121 is a deficient number, since it is larger than the sum of its proper divisors (6095331).

79239121 is a wasteful number, since it uses less digits than its factorization.

79239121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095330.

The product of its digits is 6804, while the sum is 34.

The square root of 79239121 is about 8901.6358608966. The cubic root of 79239121 is about 429.5165307105.

The spelling of 79239121 in words is "seventy-nine million, two hundred thirty-nine thousand, one hundred twenty-one".