99820187 has 2 divisors, whose sum is σ = 99820188. Its totient is φ = 99820186.

The previous prime is 99820181. The next prime is 99820223. The reversal of 99820187 is 78102899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99820187 - 2²² = 95625883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99820181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49910093 + 49910094.

It is an arithmetic number, because the mean of its divisors is an integer number (49910094).

Almost surely, 2^99820187 is an apocalyptic number.

99820187 is a deficient number, since it is larger than the sum of its proper divisors (1).

99820187 is an equidigital number, since it uses as much as digits as its factorization.

99820187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 99820187 is about 9991.0053047729. The cubic root of 99820187 is about 463.8805104400.

The spelling of 99820187 in words is "ninety-nine million, eight hundred twenty thousand, one hundred eighty-seven".