109381 has 4 divisors (see below), whose sum is σ = 110700. Its totient is φ = 108064.

The previous prime is 109379. The next prime is 109387. The reversal of 109381 is 183901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183901 = 19 ⋅9679.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 36481 = 270^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 109381 - 2¹ = 109379 is a prime.

It is a super-2 number, since 2×109381² = 23928406322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109387) 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, 526 + ... + 703.

It is an arithmetic number, because the mean of its divisors is an integer number (27675).

2¹⁰⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

109381 is a deficient number, since it is larger than the sum of its proper divisors (1319).

109381 is an equidigital number, since it uses as much as digits as its factorization.

109381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 109381 is about 330.7279849060. The cubic root of 109381 is about 47.8241540361.

The spelling of 109381 in words is "one hundred nine thousand, three hundred eighty-one".