91159644 has 96 divisors (see below), whose sum is σ = 245548800. Its totient is φ = 26127360.

The previous prime is 91159637. The next prime is 91159693. The reversal of 91159644 is 44695119.

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 31 ways as a sum of consecutive naturals, for example, 111999 + ... + 112809.

It is an arithmetic number, because the mean of its divisors is an integer number (2557800).

Almost surely, 2^91159644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91159644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122774400).

91159644 is an abundant number, since it is smaller than the sum of its proper divisors (154389156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91159644 is a wasteful number, since it uses less digits than its factorization.

91159644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 881 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 91159644 is about 9547.7559667180. The cubic root of 91159644 is about 450.0570199351.

The spelling of 91159644 in words is "ninety-one million, one hundred fifty-nine thousand, six hundred forty-four".