170131 has 8 divisors (see below), whose sum is σ = 191520. Its totient is φ = 149952.

The previous prime is 170123. The next prime is 170141. The reversal of 170131 is 131071.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 170131 - 2³ = 170123 is a prime.

It is a super-2 number, since 2×170131² = 57889114322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15 + ... + 583.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2¹⁷⁰¹³¹ is an apocalyptic number.

170131 is a deficient number, since it is larger than the sum of its proper divisors (21389).

170131 is a wasteful number, since it uses less digits than its factorization.

170131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its (nonzero) digits is 21, while the sum is 13.

The square root of 170131 is about 412.4693928039. The cubic root of 170131 is about 55.4108082324.

Subtracting from 170131 its reverse (131071), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 170131 in words is "one hundred seventy thousand, one hundred thirty-one".