170985187 has 2 divisors, whose sum is σ = 170985188. Its totient is φ = 170985186.

The previous prime is 170985091. The next prime is 170985193. The reversal of 170985187 is 781589071.

It is a strong prime.

It is an emirp because it is prime and its reverse (781589071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170985187 - 2²⁷ = 36767459 is a prime.

It is not a weakly prime, because it can be changed into another prime (170983187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85492593 + 85492594.

It is an arithmetic number, because the mean of its divisors is an integer number (85492594).

Almost surely, 2^170985187 is an apocalyptic number.

170985187 is a deficient number, since it is larger than the sum of its proper divisors (1).

170985187 is an equidigital number, since it uses as much as digits as its factorization.

170985187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 46.

The square root of 170985187 is about 13076.1304291445. The cubic root of 170985187 is about 555.0338826269.

The spelling of 170985187 in words is "one hundred seventy million, nine hundred eighty-five thousand, one hundred eighty-seven".