85199987 has 2 divisors, whose sum is σ = 85199988. Its totient is φ = 85199986.

The previous prime is 85199977. The next prime is 85199993. The reversal of 85199987 is 78999158.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85199987 - 2⁶ = 85199923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85199977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42599993 + 42599994.

It is an arithmetic number, because the mean of its divisors is an integer number (42599994).

Almost surely, 2^85199987 is an apocalyptic number.

85199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

85199987 is an equidigital number, since it uses as much as digits as its factorization.

85199987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 56.

The square root of 85199987 is about 9230.3839031754. The cubic root of 85199987 is about 440.0275241046.

The spelling of 85199987 in words is "eighty-five million, one hundred ninety-nine thousand, nine hundred eighty-seven".