99999587 has 2 divisors, whose sum is σ = 99999588. Its totient is φ = 99999586.

The previous prime is 99999563. The next prime is 99999589. The reversal of 99999587 is 78599999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99999587 - 2²⁴ = 83222371 is a prime.

Together with 99999589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99999589) 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, 49999793 + 49999794.

It is an arithmetic number, because the mean of its divisors is an integer number (49999794).

Almost surely, 2^99999587 is an apocalyptic number.

99999587 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999587 is an equidigital number, since it uses as much as digits as its factorization.

99999587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16533720, while the sum is 65.

The square root of 99999587 is about 9999.9793499787. The cubic root of 99999587 is about 464.1582443683.

The spelling of 99999587 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred eighty-seven".