109039681 has 4 divisors (see below), whose sum is σ = 112799700. Its totient is φ = 105279664.

The previous prime is 109039669. The next prime is 109039691. The reversal of 109039681 is 186930901.

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 36108081 + 72931600 = 6009^2 + 8540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109039681 is a prime.

It is a super-4 number, since 4×109039681⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109039681.

It is not an unprimeable number, because it can be changed into a prime (109039631) 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, 1879966 + ... + 1880023.

It is an arithmetic number, because the mean of its divisors is an integer number (28199925).

Almost surely, 2^109039681 is an apocalyptic number.

It is an amenable number.

109039681 is a deficient number, since it is larger than the sum of its proper divisors (3760019).

109039681 is an equidigital number, since it uses as much as digits as its factorization.

109039681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760018.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 109039681 is about 10442.2067112273. The cubic root of 109039681 is about 477.7435775632.

The spelling of 109039681 in words is "one hundred nine million, thirty-nine thousand, six hundred eighty-one".