91944571 has 4 divisors (see below), whose sum is σ = 92668672. Its totient is φ = 91220472.

The previous prime is 91944557. The next prime is 91944581. The reversal of 91944571 is 17544919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91944571 - 2²¹ = 89847419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91944511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361860 + ... + 362113.

It is an arithmetic number, because the mean of its divisors is an integer number (23167168).

Almost surely, 2^91944571 is an apocalyptic number.

91944571 is a deficient number, since it is larger than the sum of its proper divisors (724101).

91944571 is a wasteful number, since it uses less digits than its factorization.

91944571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724100.

The product of its digits is 45360, while the sum is 40.

The square root of 91944571 is about 9588.7731749166. The cubic root of 91944571 is about 451.3450636242.

The spelling of 91944571 in words is "ninety-one million, nine hundred forty-four thousand, five hundred seventy-one".