99089581 has 4 divisors (see below), whose sum is σ = 99344700. Its totient is φ = 98834464.

The previous prime is 99089563. The next prime is 99089593. The reversal of 99089581 is 18598099.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8649481 + 90440100 = 2941^2 + 9510^2 .

It is a cyclic number.

It is not a de Polignac number, because 99089581 - 2²⁵ = 65535149 is a prime.

It is a super-2 number, since 2×99089581² = 19637490125511122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99089521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126976 + ... + 127753.

It is an arithmetic number, because the mean of its divisors is an integer number (24836175).

Almost surely, 2^99089581 is an apocalyptic number.

It is an amenable number.

99089581 is a deficient number, since it is larger than the sum of its proper divisors (255119).

99089581 is a wasteful number, since it uses less digits than its factorization.

99089581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255118.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 99089581 is about 9954.3749678219. The cubic root of 99089581 is about 462.7459900088.

The spelling of 99089581 in words is "ninety-nine million, eighty-nine thousand, five hundred eighty-one".