79908181 has 8 divisors (see below), whose sum is σ = 80972640. Its totient is φ = 78850992.

The previous prime is 79908161. The next prime is 79908229. The reversal of 79908181 is 18180997.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79908181 is a prime.

It is a super-2 number, since 2×79908181² = 12770634781457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79908151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22386 + ... + 25708.

It is an arithmetic number, because the mean of its divisors is an integer number (10121580).

Almost surely, 2^79908181 is an apocalyptic number.

It is an amenable number.

79908181 is a deficient number, since it is larger than the sum of its proper divisors (1064459).

79908181 is a wasteful number, since it uses less digits than its factorization.

79908181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 79908181 is about 8939.1375982250. The cubic root of 79908181 is about 430.7220265329.

It can be divided in two parts, 79908 and 181, that added together give a square (80089 = 283²).

The spelling of 79908181 in words is "seventy-nine million, nine hundred eight thousand, one hundred eighty-one".