79944391 has 2 divisors, whose sum is σ = 79944392. Its totient is φ = 79944390.

The previous prime is 79944349. The next prime is 79944401. The reversal of 79944391 is 19344997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79944391 - 2²¹ = 77847239 is a prime.

It is a super-2 number, since 2×79944391² = 12782211304721762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79944331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39972195 + 39972196.

It is an arithmetic number, because the mean of its divisors is an integer number (39972196).

Almost surely, 2^79944391 is an apocalyptic number.

79944391 is a deficient number, since it is larger than the sum of its proper divisors (1).

79944391 is an equidigital number, since it uses as much as digits as its factorization.

79944391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 79944391 is about 8941.1627319941. The cubic root of 79944391 is about 430.7870765656.

The spelling of 79944391 in words is "seventy-nine million, nine hundred forty-four thousand, three hundred ninety-one".