91143984 has 80 divisors (see below), whose sum is σ = 249671520. Its totient is φ = 28600320.

The previous prime is 91143973. The next prime is 91144033. The reversal of 91143984 is 48934119.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56274 + ... + 57870.

It is an arithmetic number, because the mean of its divisors is an integer number (3120894).

Almost surely, 2^91143984 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 91143984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124835760).

91143984 is an abundant number, since it is smaller than the sum of its proper divisors (158527536).

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

91143984 is a wasteful number, since it uses less digits than its factorization.

91143984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1672 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 91143984 is about 9546.9358435050. The cubic root of 91143984 is about 450.0312472129.

The spelling of 91143984 in words is "ninety-one million, one hundred forty-three thousand, nine hundred eighty-four".