109749 has 4 divisors (see below), whose sum is σ = 146336. Its totient is φ = 73164.

The previous prime is 109741. The next prime is 109751. The reversal of 109749 is 947901.

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: 947901 = 3 ⋅315967.

It is not a de Polignac number, because 109749 - 2³ = 109741 is a prime.

It is a D-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 (109741) 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, 18289 + ... + 18294.

It is an arithmetic number, because the mean of its divisors is an integer number (36584).

2¹⁰⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

109749 is a deficient number, since it is larger than the sum of its proper divisors (36587).

109749 is an equidigital number, since it uses as much as digits as its factorization.

109749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36586.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 109749 is about 331.2838661933. The cubic root of 109749 is about 47.8777269862.

It can be divided in two parts, 109 and 749, that added together give a palindrome (858).

The spelling of 109749 in words is "one hundred nine thousand, seven hundred forty-nine".