99558491 has 4 divisors (see below), whose sum is σ = 99783672. Its totient is φ = 99333312.

The previous prime is 99558463. The next prime is 99558497. The reversal of 99558491 is 19485599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19485599 = 7 ⋅2783657.

It is a cyclic number.

It is not a de Polignac number, because 99558491 - 2¹⁰ = 99557467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99558497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111926 + ... + 112811.

It is an arithmetic number, because the mean of its divisors is an integer number (24945918).

Almost surely, 2^99558491 is an apocalyptic number.

99558491 is a deficient number, since it is larger than the sum of its proper divisors (225181).

99558491 is a wasteful number, since it uses less digits than its factorization.

99558491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225180.

The product of its digits is 583200, while the sum is 50.

The square root of 99558491 is about 9977.9001297868. The cubic root of 99558491 is about 463.4747744891.

The spelling of 99558491 in words is "ninety-nine million, five hundred fifty-eight thousand, four hundred ninety-one".