91945090 has 16 divisors (see below), whose sum is σ = 165612672. Its totient is φ = 36753264.

The previous prime is 91945081. The next prime is 91945121. The reversal of 91945090 is 9054919.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22807 + ... + 26533.

It is an arithmetic number, because the mean of its divisors is an integer number (10350792).

Almost surely, 2^91945090 is an apocalyptic number.

91945090 is a deficient number, since it is larger than the sum of its proper divisors (73667582).

91945090 is a wasteful number, since it uses less digits than its factorization.

91945090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 91945090 is about 9588.8002377774. The cubic root of 91945090 is about 451.3459128592.

The spelling of 91945090 in words is "ninety-one million, nine hundred forty-five thousand, ninety".