91901944 has 16 divisors (see below), whose sum is σ = 172435320. Its totient is φ = 45919200.

The previous prime is 91901939. The next prime is 91901959. The reversal of 91901944 is 44910919.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12187 + ... + 18229.

Almost surely, 2^91901944 is an apocalyptic number.

It is an amenable number.

91901944 is a deficient number, since it is larger than the sum of its proper divisors (80533376).

91901944 is a wasteful number, since it uses less digits than its factorization.

91901944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950 (or 7946 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 91901944 is about 9586.5501615545. The cubic root of 91901944 is about 451.2753025358.

Subtracting from 91901944 its reverse (44910919), we obtain a square (46991025 = 6855²).

The spelling of 91901944 in words is "ninety-one million, nine hundred one thousand, nine hundred forty-four".