79939081 has 4 divisors (see below), whose sum is σ = 80035200. Its totient is φ = 79842964.

The previous prime is 79939063. The next prime is 79939087. The reversal of 79939081 is 18093997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79939081 - 2⁷ = 79938953 is a prime.

It is a super-2 number, since 2×79939081² = 12780513342249122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79939087) 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, 46801 + ... + 48478.

It is an arithmetic number, because the mean of its divisors is an integer number (20008800).

Almost surely, 2^79939081 is an apocalyptic number.

It is an amenable number.

79939081 is a deficient number, since it is larger than the sum of its proper divisors (96119).

79939081 is an equidigital number, since it uses as much as digits as its factorization.

79939081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96118.

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

The square root of 79939081 is about 8940.8657858174. The cubic root of 79939081 is about 430.7775385605. Note that the first 3 decimals are identical.

The spelling of 79939081 in words is "seventy-nine million, nine hundred thirty-nine thousand, eighty-one".