99187321 has 4 divisors (see below), whose sum is σ = 102386944. Its totient is φ = 95987700.

The previous prime is 99187313. The next prime is 99187349. The reversal of 99187321 is 12378199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99187321 - 2³ = 99187313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99187021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1599765 + ... + 1599826.

It is an arithmetic number, because the mean of its divisors is an integer number (25596736).

Almost surely, 2^99187321 is an apocalyptic number.

It is an amenable number.

99187321 is a deficient number, since it is larger than the sum of its proper divisors (3199623).

99187321 is a wasteful number, since it uses less digits than its factorization.

99187321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199622.

The product of its digits is 27216, while the sum is 40.

The square root of 99187321 is about 9959.2831569345. The cubic root of 99187321 is about 462.8980878373.

The spelling of 99187321 in words is "ninety-nine million, one hundred eighty-seven thousand, three hundred twenty-one".