99999187 has 2 divisors, whose sum is σ = 99999188. Its totient is φ = 99999186.

The previous prime is 99999167. The next prime is 99999217. The reversal of 99999187 is 78199999.

It is a weak prime.

It is an emirp because it is prime and its reverse (78199999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99999187 is a prime.

It is not a weakly prime, because it can be changed into another prime (99999157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999593 + 49999594.

It is an arithmetic number, because the mean of its divisors is an integer number (49999594).

Almost surely, 2^99999187 is an apocalyptic number.

99999187 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999187 is an equidigital number, since it uses as much as digits as its factorization.

99999187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 61.

The square root of 99999187 is about 9999.9593499174. The cubic root of 99999187 is about 464.1576254873.

The spelling of 99999187 in words is "ninety-nine million, nine hundred ninety-nine thousand, one hundred eighty-seven".