170985091 has 2 divisors, whose sum is σ = 170985092. Its totient is φ = 170985090.

The previous prime is 170985079. The next prime is 170985187. The reversal of 170985091 is 190589071.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 170985091 - 2¹⁹ = 170460803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (170985041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85492545 + 85492546.

It is an arithmetic number, because the mean of its divisors is an integer number (85492546).

Almost surely, 2^170985091 is an apocalyptic number.

170985091 is a deficient number, since it is larger than the sum of its proper divisors (1).

170985091 is an equidigital number, since it uses as much as digits as its factorization.

170985091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 170985091 is about 13076.1267583333. The cubic root of 170985091 is about 555.0337787519.

The spelling of 170985091 in words is "one hundred seventy million, nine hundred eighty-five thousand, ninety-one".