79070891 has 2 divisors, whose sum is σ = 79070892. Its totient is φ = 79070890.

The previous prime is 79070881. The next prime is 79070903. The reversal of 79070891 is 19807097.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79070891 is a prime.

It is not a weakly prime, because it can be changed into another prime (79070821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39535445 + 39535446.

It is an arithmetic number, because the mean of its divisors is an integer number (39535446).

Almost surely, 2^79070891 is an apocalyptic number.

79070891 is a deficient number, since it is larger than the sum of its proper divisors (1).

79070891 is an equidigital number, since it uses as much as digits as its factorization.

79070891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 79070891 is about 8892.1814533893. The cubic root of 79070891 is about 429.2123511531.

The spelling of 79070891 in words is "seventy-nine million, seventy thousand, eight hundred ninety-one".