78791099 has 2 divisors, whose sum is σ = 78791100. Its totient is φ = 78791098.

The previous prime is 78791071. The next prime is 78791113. The reversal of 78791099 is 99019787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78791099 - 2⁸ = 78790843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78791059) 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 as a sum of consecutive naturals, namely, 39395549 + 39395550.

It is an arithmetic number, because the mean of its divisors is an integer number (39395550).

Almost surely, 2^78791099 is an apocalyptic number.

78791099 is a deficient number, since it is larger than the sum of its proper divisors (1).

78791099 is an equidigital number, since it uses as much as digits as its factorization.

78791099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 78791099 is about 8876.4350389106. The cubic root of 78791099 is about 428.7054975102.

The spelling of 78791099 in words is "seventy-eight million, seven hundred ninety-one thousand, ninety-nine".