91864291 has 2 divisors, whose sum is σ = 91864292. Its totient is φ = 91864290.

The previous prime is 91864249. The next prime is 91864319. The reversal of 91864291 is 19246819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91864291 - 2²⁵ = 58309859 is a prime.

It is equal to p_5318797 and since 91864291 and 5318797 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (91868291) by changing a digit.

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

It is an upside-down number.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932145 + 45932146.

It is an arithmetic number, because the mean of its divisors is an integer number (45932146).

Almost surely, 2^91864291 is an apocalyptic number.

91864291 is a deficient number, since it is larger than the sum of its proper divisors (1).

91864291 is an equidigital number, since it uses as much as digits as its factorization.

91864291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 91864291 is about 9584.5861152165. The cubic root of 91864291 is about 451.2136636871.

The spelling of 91864291 in words is "ninety-one million, eight hundred sixty-four thousand, two hundred ninety-one".