170099987 has 2 divisors, whose sum is σ = 170099988. Its totient is φ = 170099986.

The previous prime is 170099947. The next prime is 170100031. The reversal of 170099987 is 789990071.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 170099987 - 2¹⁶ = 170034451 is a prime.

It is not a weakly prime, because it can be changed into another prime (170099947) 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, 85049993 + 85049994.

It is an arithmetic number, because the mean of its divisors is an integer number (85049994).

Almost surely, 2^170099987 is an apocalyptic number.

170099987 is a deficient number, since it is larger than the sum of its proper divisors (1).

170099987 is an equidigital number, since it uses as much as digits as its factorization.

170099987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 170099987 is about 13042.2385731898. The cubic root of 170099987 is about 554.0744110192.

The spelling of 170099987 in words is "one hundred seventy million, ninety-nine thousand, nine hundred eighty-seven".