91313091 has 12 divisors (see below), whose sum is σ = 132635880. Its totient is φ = 60534240.

The previous prime is 91313081. The next prime is 91313099. The reversal of 91313091 is 19031319.

It is not a de Polignac number, because 91313091 - 2²¹ = 89215939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91313099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26730 + ... + 29951.

It is an arithmetic number, because the mean of its divisors is an integer number (11052990).

Almost surely, 2^91313091 is an apocalyptic number.

91313091 is a deficient number, since it is larger than the sum of its proper divisors (41322789).

91313091 is a wasteful number, since it uses less digits than its factorization.

91313091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56866 (or 56863 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 91313091 is about 9555.7883505235. The cubic root of 91313091 is about 450.3094020336.

The spelling of 91313091 in words is "ninety-one million, three hundred thirteen thousand, ninety-one".