91744289 has 16 divisors (see below), whose sum is σ = 113611008. Its totient is φ = 72142272.

The previous prime is 91744273. The next prime is 91744297. The reversal of 91744289 is 98244719.

It is a cyclic number.

It is not a de Polignac number, because 91744289 - 2⁴ = 91744273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91744229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12179 + ... + 18215.

It is an arithmetic number, because the mean of its divisors is an integer number (7100688).

Almost surely, 2^91744289 is an apocalyptic number.

It is an amenable number.

91744289 is a deficient number, since it is larger than the sum of its proper divisors (21866719).

91744289 is a wasteful number, since it uses less digits than its factorization.

91744289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6224.

The product of its digits is 145152, while the sum is 44.

The square root of 91744289 is about 9578.3239139215. The cubic root of 91744289 is about 451.0171051341.

The spelling of 91744289 in words is "ninety-one million, seven hundred forty-four thousand, two hundred eighty-nine".