170985511 has 2 divisors, whose sum is σ = 170985512. Its totient is φ = 170985510.

The previous prime is 170985509. The next prime is 170985517. The reversal of 170985511 is 115589071.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 170985511 - 2¹ = 170985509 is a prime.

It is a super-2 number, since 2×170985511² = 58472089943862242, which contains 22 as substring.

Together with 170985509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170985517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85492755 + 85492756.

It is an arithmetic number, because the mean of its divisors is an integer number (85492756).

Almost surely, 2^170985511 is an apocalyptic number.

170985511 is a deficient number, since it is larger than the sum of its proper divisors (1).

170985511 is an equidigital number, since it uses as much as digits as its factorization.

170985511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 170985511 is about 13076.1428181249. The cubic root of 170985511 is about 555.0342332048.

The spelling of 170985511 in words is "one hundred seventy million, nine hundred eighty-five thousand, five hundred eleven".