88491591 has 6 divisors (see below), whose sum is σ = 127821200. Its totient is φ = 58994388.

The previous prime is 88491581. The next prime is 88491619. The reversal of 88491591 is 19519488.

It is not a de Polignac number, because 88491591 - 2¹⁴ = 88475207 is a prime.

It is a super-2 number, since 2×88491591² = 15661523355422562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88491521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4916191 + ... + 4916208.

Almost surely, 2^88491591 is an apocalyptic number.

88491591 is a deficient number, since it is larger than the sum of its proper divisors (39329609).

88491591 is a wasteful number, since it uses less digits than its factorization.

88491591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9832405 (or 9832402 counting only the distinct ones).

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

The square root of 88491591 is about 9406.9969171888. The cubic root of 88491591 is about 445.6227295477.

It can be divided in two parts, 8849 and 1591, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 88491591 in words is "eighty-eight million, four hundred ninety-one thousand, five hundred ninety-one".