170087381 has 2 divisors, whose sum is σ = 170087382. Its totient is φ = 170087380.

The previous prime is 170087377. The next prime is 170087399. The reversal of 170087381 is 183780071.

170087381 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 can be written as a sum of positive squares in only one way, i.e., 146652100 + 23435281 = 12110^2 + 4841^2 .

It is an emirp because it is prime and its reverse (183780071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170087381 - 2² = 170087377 is a prime.

It is a super-2 number, since 2×170087381² = 57859434350878322, 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 (170087321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85043690 + 85043691.

It is an arithmetic number, because the mean of its divisors is an integer number (85043691).

Almost surely, 2^170087381 is an apocalyptic number.

It is an amenable number.

170087381 is a deficient number, since it is larger than the sum of its proper divisors (1).

170087381 is an equidigital number, since it uses as much as digits as its factorization.

170087381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 170087381 is about 13041.7552883038. The cubic root of 170087381 is about 554.0607233157.

It can be divided in two parts, 17008 and 7381, that added together give a cube (24389 = 29³).

The spelling of 170087381 in words is "one hundred seventy million, eighty-seven thousand, three hundred eighty-one".