163975 has 12 divisors (see below), whose sum is σ = 232624. Its totient is φ = 112320.

The previous prime is 163973. The next prime is 163979. The reversal of 163975 is 579361.

163975 = T₁₄₆ + T₁₄₇ + ... + T₁₅₉.

It is not a de Polignac number, because 163975 - 2¹ = 163973 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 294 + ... + 643.

2¹⁶³⁹⁷⁵ is an apocalyptic number.

163975 is a deficient number, since it is larger than the sum of its proper divisors (68649).

163975 is an equidigital number, since it uses as much as digits as its factorization.

163975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 949 counting only the distinct ones).

The product of its digits is 5670, while the sum is 31.

The square root of 163975 is about 404.9382669000. The cubic root of 163975 is about 54.7342552532.

The spelling of 163975 in words is "one hundred sixty-three thousand, nine hundred seventy-five".