91945091 has 8 divisors (see below), whose sum is σ = 105491040. Its totient is φ = 78501888.

The previous prime is 91945081. The next prime is 91945121. The reversal of 91945091 is 19054919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91945091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91945081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23756 + ... + 27353.

It is an arithmetic number, because the mean of its divisors is an integer number (13186380).

Almost surely, 2^91945091 is an apocalyptic number.

91945091 is a deficient number, since it is larger than the sum of its proper divisors (13545949).

91945091 is a wasteful number, since it uses less digits than its factorization.

91945091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51373.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 91945091 is about 9588.8002899216. The cubic root of 91945091 is about 451.3459144955.

The spelling of 91945091 in words is "ninety-one million, nine hundred forty-five thousand, ninety-one".