99217187 has 4 divisors (see below), whose sum is σ = 99446760. Its totient is φ = 98987616.

The previous prime is 99217169. The next prime is 99217201. The reversal of 99217187 is 78171299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78171299 = 2887 ⋅27077.

It is a cyclic number.

It is not a de Polignac number, because 99217187 - 2¹² = 99213091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99217087) 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, 114137 + ... + 115002.

It is an arithmetic number, because the mean of its divisors is an integer number (24861690).

Almost surely, 2^99217187 is an apocalyptic number.

99217187 is a deficient number, since it is larger than the sum of its proper divisors (229573).

99217187 is a wasteful number, since it uses less digits than its factorization.

99217187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229572.

The product of its digits is 63504, while the sum is 44.

The square root of 99217187 is about 9960.7824491854. The cubic root of 99217187 is about 462.9445437982.

The spelling of 99217187 in words is "ninety-nine million, two hundred seventeen thousand, one hundred eighty-seven".