170039981 has 2 divisors, whose sum is σ = 170039982. Its totient is φ = 170039980.

The previous prime is 170039977. The next prime is 170039999. The reversal of 170039981 is 189930071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169780900 + 259081 = 13030^2 + 509^2 .

It is an emirp because it is prime and its reverse (189930071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170039981 - 2² = 170039977 is a prime.

It is a super-2 number, since 2×170039981² = 57827190276960722, 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 (170039921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85019990 + 85019991.

It is an arithmetic number, because the mean of its divisors is an integer number (85019991).

Almost surely, 2^170039981 is an apocalyptic number.

It is an amenable number.

170039981 is a deficient number, since it is larger than the sum of its proper divisors (1).

170039981 is an equidigital number, since it uses as much as digits as its factorization.

170039981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 170039981 is about 13039.9379216314. The cubic root of 170039981 is about 554.0092499335.

The spelling of 170039981 in words is "one hundred seventy million, thirty-nine thousand, nine hundred eighty-one".