79093981 has 2 divisors, whose sum is σ = 79093982. Its totient is φ = 79093980.

The previous prime is 79093939. The next prime is 79094021. The reversal of 79093981 is 18939097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79049881 + 44100 = 8891^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 79093981 - 2⁷ = 79093853 is a prime.

It is a super-2 number, since 2×79093981² = 12511715660856722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79093081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39546990 + 39546991.

It is an arithmetic number, because the mean of its divisors is an integer number (39546991).

Almost surely, 2^79093981 is an apocalyptic number.

It is an amenable number.

79093981 is a deficient number, since it is larger than the sum of its proper divisors (1).

79093981 is an equidigital number, since it uses as much as digits as its factorization.

79093981 is an odious number, because the sum of its binary digits is odd.

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

The square root of 79093981 is about 8893.4796902000. The cubic root of 79093981 is about 429.2541261078.

The spelling of 79093981 in words is "seventy-nine million, ninety-three thousand, nine hundred eighty-one".