45109 has 4 divisors (see below), whose sum is σ = 45760. Its totient is φ = 44460.

The previous prime is 45083. The next prime is 45119. The reversal of 45109 is 90154.

45109 is nontrivially palindromic in base 14.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90154 = 2 ⋅45077.

It is a cyclic number.

It is not a de Polignac number, because 45109 - 2⁵ = 45077 is a prime.

It is a Duffinian number.

45109 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207 + ... + 364.

It is an arithmetic number, because the mean of its divisors is an integer number (11440).

2⁴⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

45109 is a deficient number, since it is larger than the sum of its proper divisors (651).

45109 is an equidigital number, since it uses as much as digits as its factorization.

45109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 45109 is about 212.3887944313. The cubic root of 45109 is about 35.5976285084.

The spelling of 45109 in words is "forty-five thousand, one hundred nine".