99984521 has 8 divisors (see below), whose sum is σ = 123057984. Its totient is φ = 79108560.

The previous prime is 99984491. The next prime is 99984529. The reversal of 99984521 is 12548999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99984521 - 2⁶ = 99984457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99984529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549275 + ... + 549456.

It is an arithmetic number, because the mean of its divisors is an integer number (15382248).

Almost surely, 2^99984521 is an apocalyptic number.

99984521 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

99984521 is a deficient number, since it is larger than the sum of its proper divisors (23073463).

99984521 is a wasteful number, since it uses less digits than its factorization.

99984521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098751.

The product of its digits is 233280, while the sum is 47.

The square root of 99984521 is about 9999.2260200478. The cubic root of 99984521 is about 464.1349330743.

The spelling of 99984521 in words is "ninety-nine million, nine hundred eighty-four thousand, five hundred twenty-one".