91955891 has 2 divisors, whose sum is σ = 91955892. Its totient is φ = 91955890.

The previous prime is 91955869. The next prime is 91955911. The reversal of 91955891 is 19855919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91955891 - 2¹⁰ = 91954867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91955821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45977945 + 45977946.

It is an arithmetic number, because the mean of its divisors is an integer number (45977946).

Almost surely, 2^91955891 is an apocalyptic number.

91955891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91955891 is an equidigital number, since it uses as much as digits as its factorization.

91955891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 47.

The square root of 91955891 is about 9589.3634303847. The cubic root of 91955891 is about 451.3635857128.

The spelling of 91955891 in words is "ninety-one million, nine hundred fifty-five thousand, eight hundred ninety-one".