170985431 has 2 divisors, whose sum is σ = 170985432. Its totient is φ = 170985430.

The previous prime is 170985401. The next prime is 170985499. The reversal of 170985431 is 134589071.

170985431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (134589071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170985431 - 2¹⁴ = 170969047 is a prime.

It is a super-2 number, since 2×170985431² = 58472035228511522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170985401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85492715 + 85492716.

It is an arithmetic number, because the mean of its divisors is an integer number (85492716).

Almost surely, 2^170985431 is an apocalyptic number.

170985431 is a deficient number, since it is larger than the sum of its proper divisors (1).

170985431 is an equidigital number, since it uses as much as digits as its factorization.

170985431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 170985431 is about 13076.1397591185. The cubic root of 170985431 is about 555.0341466424.

The spelling of 170985431 in words is "one hundred seventy million, nine hundred eighty-five thousand, four hundred thirty-one".