91901867 has 2 divisors, whose sum is σ = 91901868. Its totient is φ = 91901866.

The previous prime is 91901857. The next prime is 91901911. The reversal of 91901867 is 76810919.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (76810919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91901867 - 2²⁶ = 24793003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91901827) 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, 45950933 + 45950934.

It is an arithmetic number, because the mean of its divisors is an integer number (45950934).

Almost surely, 2^91901867 is an apocalyptic number.

91901867 is a deficient number, since it is larger than the sum of its proper divisors (1).

91901867 is an equidigital number, since it uses as much as digits as its factorization.

91901867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 91901867 is about 9586.5461455104. The cubic root of 91901867 is about 451.2751765022.

The spelling of 91901867 in words is "ninety-one million, nine hundred one thousand, eight hundred sixty-seven".