79159121 has 4 divisors (see below), whose sum is σ = 79445172. Its totient is φ = 78873072.

The previous prime is 79159109. The next prime is 79159127. The reversal of 79159121 is 12195197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12195197 = 7 ⋅1742171.

It can be written as a sum of positive squares in 2 ways, for example, as 5456896 + 73702225 = 2336^2 + 8585^2 .

It is a cyclic number.

It is not a de Polignac number, because 79159121 - 2⁶ = 79159057 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 (79159127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142610 + ... + 143163.

It is an arithmetic number, because the mean of its divisors is an integer number (19861293).

Almost surely, 2^79159121 is an apocalyptic number.

It is an amenable number.

79159121 is a deficient number, since it is larger than the sum of its proper divisors (286051).

79159121 is a wasteful number, since it uses less digits than its factorization.

79159121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286050.

The product of its digits is 5670, while the sum is 35.

The square root of 79159121 is about 8897.1411700613. The cubic root of 79159121 is about 429.3719350770.

The spelling of 79159121 in words is "seventy-nine million, one hundred fifty-nine thousand, one hundred twenty-one".