99544591 has 4 divisors (see below), whose sum is σ = 104783800. Its totient is φ = 94305384.

The previous prime is 99544583. The next prime is 99544603. The reversal of 99544591 is 19544599.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99544591 - 2³ = 99544583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99544891) 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, 2619576 + ... + 2619613.

It is an arithmetic number, because the mean of its divisors is an integer number (26195950).

Almost surely, 2^99544591 is an apocalyptic number.

99544591 is a deficient number, since it is larger than the sum of its proper divisors (5239209).

99544591 is a wasteful number, since it uses less digits than its factorization.

99544591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239208.

The product of its digits is 291600, while the sum is 46.

The square root of 99544591 is about 9977.2035661301. The cubic root of 99544591 is about 463.4532039224.

The spelling of 99544591 in words is "ninety-nine million, five hundred forty-four thousand, five hundred ninety-one".