173131 has 4 divisors (see below), whose sum is σ = 197872. Its totient is φ = 148392.

The previous prime is 173099. The next prime is 173137. The reversal of 173131 is 131371.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 173131 - 2⁵ = 173099 is a prime.

It is a super-2 number, since 2×173131² = 59948686322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12360 + ... + 12373.

It is an arithmetic number, because the mean of its divisors is an integer number (49468).

2¹⁷³¹³¹ is an apocalyptic number.

173131 is a deficient number, since it is larger than the sum of its proper divisors (24741).

173131 is an equidigital number, since it uses as much as digits as its factorization.

173131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24740.

The product of its digits is 63, while the sum is 16.

The square root of 173131 is about 416.0901344661. The cubic root of 173131 is about 55.7346073453.

The spelling of 173131 in words is "one hundred seventy-three thousand, one hundred thirty-one".