108091945 has 8 divisors (see below), whose sum is σ = 139688136. Its totient is φ = 79821696.

The previous prime is 108091943. The next prime is 108091993. The reversal of 108091945 is 549190801.

It can be written as a sum of positive squares in 4 ways, for example, as 15129 + 108076816 = 123^2 + 10396^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 108091945 - 2¹ = 108091943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108091943) 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 7 ways as a sum of consecutive naturals, for example, 831412 + ... + 831541.

It is an arithmetic number, because the mean of its divisors is an integer number (17461017).

Almost surely, 2^108091945 is an apocalyptic number.

It is an amenable number.

108091945 is a deficient number, since it is larger than the sum of its proper divisors (31596191).

108091945 is a wasteful number, since it uses less digits than its factorization.

108091945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662971.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 108091945 is about 10396.7276101666. The cubic root of 108091945 is about 476.3554194705.

It can be divided in two parts, 1080 and 91945, that added together give a square (93025 = 305²).

The spelling of 108091945 in words is "one hundred eight million, ninety-one thousand, nine hundred forty-five".