91820159 has 2 divisors, whose sum is σ = 91820160. Its totient is φ = 91820158.

The previous prime is 91820153. The next prime is 91820219. The reversal of 91820159 is 95102819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91820159 - 2²⁴ = 75042943 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 (91820153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45910079 + 45910080.

It is an arithmetic number, because the mean of its divisors is an integer number (45910080).

Almost surely, 2^91820159 is an apocalyptic number.

91820159 is a deficient number, since it is larger than the sum of its proper divisors (1).

91820159 is an equidigital number, since it uses as much as digits as its factorization.

91820159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 91820159 is about 9582.2836004785. The cubic root of 91820159 is about 451.1413971194.

The spelling of 91820159 in words is "ninety-one million, eight hundred twenty thousand, one hundred fifty-nine".