108609749 has 4 divisors (see below), whose sum is σ = 113331936. Its totient is φ = 103887564.

The previous prime is 108609713. The next prime is 108609791. The reversal of 108609749 is 947906801.

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: 947906801 = 21881 ⋅43321.

It is a cyclic number.

It is not a de Polignac number, because 108609749 - 2²⁰ = 107561173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108609049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361059 + ... + 2361104.

It is an arithmetic number, because the mean of its divisors is an integer number (28332984).

Almost surely, 2^108609749 is an apocalyptic number.

It is an amenable number.

108609749 is a deficient number, since it is larger than the sum of its proper divisors (4722187).

108609749 is an equidigital number, since it uses as much as digits as its factorization.

108609749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722186.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 108609749 is about 10421.6001170646. The cubic root of 108609749 is about 477.1148529373.

The spelling of 108609749 in words is "one hundred eight million, six hundred nine thousand, seven hundred forty-nine".