79623991 has 2 divisors, whose sum is σ = 79623992. Its totient is φ = 79623990.

The previous prime is 79623959. The next prime is 79624007. The reversal of 79623991 is 19932697.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79623991 - 2⁵ = 79623959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79626991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39811995 + 39811996.

It is an arithmetic number, because the mean of its divisors is an integer number (39811996).

Almost surely, 2^79623991 is an apocalyptic number.

79623991 is a deficient number, since it is larger than the sum of its proper divisors (1).

79623991 is an equidigital number, since it uses as much as digits as its factorization.

79623991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 46.

The square root of 79623991 is about 8923.2276111282. The cubic root of 79623991 is about 430.2108052362.

The spelling of 79623991 in words is "seventy-nine million, six hundred twenty-three thousand, nine hundred ninety-one".