170158981 has 2 divisors, whose sum is σ = 170158982. Its totient is φ = 170158980.

The previous prime is 170158957. The next prime is 170159021. The reversal of 170158981 is 189851071.

It is an a-pointer prime, because the next prime (170159021) can be obtained adding 170158981 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112550881 + 57608100 = 10609^2 + 7590^2 .

It is an emirp because it is prime and its reverse (189851071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170158981 - 2⁵ = 170158949 is a prime.

It is a super-2 number, since 2×170158981² = 57908157629916722, which contains 22 as substring.

It is the 13045-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170158931) by changing a digit.

It is a nontrivial repunit in base 13044.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85079490 + 85079491.

It is an arithmetic number, because the mean of its divisors is an integer number (85079491).

Almost surely, 2^170158981 is an apocalyptic number.

It is an amenable number.

170158981 is a deficient number, since it is larger than the sum of its proper divisors (1).

170158981 is an equidigital number, since it uses as much as digits as its factorization.

170158981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 40.

The square root of 170158981 is about 13044.5000287477. The cubic root of 170158981 is about 554.1384582271.

The spelling of 170158981 in words is "one hundred seventy million, one hundred fifty-eight thousand, nine hundred eighty-one".