79520191 has 2 divisors, whose sum is σ = 79520192. Its totient is φ = 79520190.

The previous prime is 79520183. The next prime is 79520219. The reversal of 79520191 is 19102597.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79520191 - 2³ = 79520183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79520171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39760095 + 39760096.

It is an arithmetic number, because the mean of its divisors is an integer number (39760096).

Almost surely, 2^79520191 is an apocalyptic number.

79520191 is a deficient number, since it is larger than the sum of its proper divisors (1).

79520191 is an equidigital number, since it uses as much as digits as its factorization.

79520191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 79520191 is about 8917.4094332379. The cubic root of 79520191 is about 430.0237791068.

The spelling of 79520191 in words is "seventy-nine million, five hundred twenty thousand, one hundred ninety-one".