99963187 has 4 divisors (see below), whose sum is σ = 100071720. Its totient is φ = 99854656.

The previous prime is 99963167. The next prime is 99963209. The reversal of 99963187 is 78136999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78136999 = 53 ⋅1474283.

It is a cyclic number.

It is not a de Polignac number, because 99963187 - 2¹⁵ = 99930419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99963107) 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, 52873 + ... + 54730.

It is an arithmetic number, because the mean of its divisors is an integer number (25017930).

Almost surely, 2^99963187 is an apocalyptic number.

99963187 is a deficient number, since it is larger than the sum of its proper divisors (108533).

99963187 is a wasteful number, since it uses less digits than its factorization.

99963187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108532.

The product of its digits is 734832, while the sum is 52.

The square root of 99963187 is about 9998.1591805692. The cubic root of 99963187 is about 464.1019194341.

The spelling of 99963187 in words is "ninety-nine million, nine hundred sixty-three thousand, one hundred eighty-seven".