91488591 has 36 divisors (see below), whose sum is σ = 144429480. Its totient is φ = 55732320.

The previous prime is 91488583. The next prime is 91488599. The reversal of 91488591 is 19588419.

It is an interprime number because it is at equal distance from previous prime (91488583) and next prime (91488599).

It is not a de Polignac number, because 91488591 - 2³ = 91488583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91488599) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 93736 + ... + 94706.

It is an arithmetic number, because the mean of its divisors is an integer number (4011930).

Almost surely, 2^91488591 is an apocalyptic number.

91488591 is a deficient number, since it is larger than the sum of its proper divisors (52940889).

91488591 is a wasteful number, since it uses less digits than its factorization.

91488591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1022 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 91488591 is about 9564.9668582803. The cubic root of 91488591 is about 450.5977094487.

The spelling of 91488591 in words is "ninety-one million, four hundred eighty-eight thousand, five hundred ninety-one".