170945381 has 2 divisors, whose sum is σ = 170945382. Its totient is φ = 170945380.

The previous prime is 170945347. The next prime is 170945393. The reversal of 170945381 is 183549071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148230625 + 22714756 = 12175^2 + 4766^2 .

It is an emirp because it is prime and its reverse (183549071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170945381 - 2⁶ = 170945317 is a prime.

It is a super-2 number, since 2×170945381² = 58444646570470322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170945321) 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, 85472690 + 85472691.

It is an arithmetic number, because the mean of its divisors is an integer number (85472691).

Almost surely, 2^170945381 is an apocalyptic number.

It is an amenable number.

170945381 is a deficient number, since it is larger than the sum of its proper divisors (1).

170945381 is an equidigital number, since it uses as much as digits as its factorization.

170945381 is an odious number, because the sum of its binary digits is odd.

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

The square root of 170945381 is about 13074.6082541696. The cubic root of 170945381 is about 554.9908079532.

The spelling of 170945381 in words is "one hundred seventy million, nine hundred forty-five thousand, three hundred eighty-one".