79218791 has 2 divisors, whose sum is σ = 79218792. Its totient is φ = 79218790.

The previous prime is 79218787. The next prime is 79218803. The reversal of 79218791 is 19781297.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79218791 - 2² = 79218787 is a prime.

It is a Sophie Germain 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 (79218721) 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, 39609395 + 39609396.

It is an arithmetic number, because the mean of its divisors is an integer number (39609396).

Almost surely, 2^79218791 is an apocalyptic number.

79218791 is a deficient number, since it is larger than the sum of its proper divisors (1).

79218791 is an equidigital number, since it uses as much as digits as its factorization.

79218791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 44.

The square root of 79218791 is about 8900.4938627022. The cubic root of 79218791 is about 429.4797945721.

The spelling of 79218791 in words is "seventy-nine million, two hundred eighteen thousand, seven hundred ninety-one".