108731 has 8 divisors (see below), whose sum is σ = 127200. Its totient is φ = 92904.

The previous prime is 108727. The next prime is 108739. The reversal of 108731 is 137801.

It is not a de Polignac number, because 108731 - 2² = 108727 is a prime.

It is a super-2 number, since 2×108731² = 23644860722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (108739) 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, 185 + ... + 501.

It is an arithmetic number, because the mean of its divisors is an integer number (15900).

2¹⁰⁸⁷³¹ is an apocalyptic number.

108731 is a deficient number, since it is larger than the sum of its proper divisors (18469).

108731 is an frugal number, since it uses more digits than its factorization.

108731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 108731 is about 329.7438399728. The cubic root of 108731 is about 47.7292335895.

The spelling of 108731 in words is "one hundred eight thousand, seven hundred thirty-one".