109081 has 4 divisors (see below), whose sum is σ = 124672. Its totient is φ = 93492.

The previous prime is 109073. The next prime is 109097. The reversal of 109081 is 180901.

109081 = 29² + 30² + ... + 70².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 109081 - 2³ = 109073 is a prime.

It is a super-2 number, since 2×109081² = 23797329122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109001) 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, 7785 + ... + 7798.

It is an arithmetic number, because the mean of its divisors is an integer number (31168).

2¹⁰⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

109081 is a deficient number, since it is larger than the sum of its proper divisors (15591).

109081 is an equidigital number, since it uses as much as digits as its factorization.

109081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15590.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 109081 is about 330.2741285660. The cubic root of 109081 is about 47.7803914601.

Adding to 109081 its reverse (180901), we get a palindrome (289982).

The spelling of 109081 in words is "one hundred nine thousand, eighty-one".