79981093 has 4 divisors (see below), whose sum is σ = 80111340. Its totient is φ = 79850848.

The previous prime is 79981079. The next prime is 79981103. The reversal of 79981093 is 39018997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39018997 = 443 ⋅88079.

It can be written as a sum of positive squares in 2 ways, for example, as 2505889 + 77475204 = 1583^2 + 8802^2 .

It is a cyclic number.

It is not a de Polignac number, because 79981093 - 2⁹ = 79980581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79951093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64198 + ... + 65431.

It is an arithmetic number, because the mean of its divisors is an integer number (20027835).

Almost surely, 2^79981093 is an apocalyptic number.

It is an amenable number.

79981093 is a deficient number, since it is larger than the sum of its proper divisors (130247).

79981093 is a wasteful number, since it uses less digits than its factorization.

79981093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130246.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 79981093 is about 8943.2149141123. The cubic root of 79981093 is about 430.8529904180.

The spelling of 79981093 in words is "seventy-nine million, nine hundred eighty-one thousand, ninety-three".