108749561 has 4 divisors (see below), whose sum is σ = 115146612. Its totient is φ = 102352512.

The previous prime is 108749551. The next prime is 108749573. The reversal of 108749561 is 165947801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34445161 + 74304400 = 5869^2 + 8620^2 .

It is a de Polignac number, because none of the positive numbers 2^k-108749561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108749551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3198500 + ... + 3198533.

It is an arithmetic number, because the mean of its divisors is an integer number (28786653).

Almost surely, 2^108749561 is an apocalyptic number.

It is an amenable number.

108749561 is a deficient number, since it is larger than the sum of its proper divisors (6397051).

108749561 is an equidigital number, since it uses as much as digits as its factorization.

108749561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6397050.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 108749561 is about 10428.3057588469. The cubic root of 108749561 is about 477.3194931881.

The spelling of 108749561 in words is "one hundred eight million, seven hundred forty-nine thousand, five hundred sixty-one".