91904945 has 12 divisors (see below), whose sum is σ = 121224180. Its totient is φ = 66839520.

The previous prime is 91904933. The next prime is 91904951. The reversal of 91904945 is 54940919.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 52867441 + 39037504 = 7271^2 + 6248^2 .

It is not a de Polignac number, because 91904945 - 2¹² = 91900849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75350 + ... + 76559.

It is an arithmetic number, because the mean of its divisors is an integer number (10102015).

Almost surely, 2^91904945 is an apocalyptic number.

It is an amenable number.

91904945 is a deficient number, since it is larger than the sum of its proper divisors (29319235).

91904945 is a wasteful number, since it uses less digits than its factorization.

91904945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151936 (or 151925 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 91904945 is about 9586.7066816504. The cubic root of 91904945 is about 451.2802145191.

The spelling of 91904945 in words is "ninety-one million, nine hundred four thousand, nine hundred forty-five".