3981109 has 4 divisors (see below), whose sum is σ = 4343040. Its totient is φ = 3619180.

The previous prime is 3981101. The next prime is 3981119. The reversal of 3981109 is 9011893.

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: 9011893 = 11 ⋅819263.

It is a cyclic number.

It is not a de Polignac number, because 3981109 - 2³ = 3981101 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (3981101) 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, 180949 + ... + 180970.

It is an arithmetic number, because the mean of its divisors is an integer number (1085760).

Almost surely, 2^3981109 is an apocalyptic number.

It is an amenable number.

3981109 is a deficient number, since it is larger than the sum of its proper divisors (361931).

3981109 is a wasteful number, since it uses less digits than its factorization.

3981109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361930.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 3981109 is about 1995.2716607019. The cubic root of 3981109 is about 158.4898141510.

The spelling of 3981109 in words is "three million, nine hundred eighty-one thousand, one hundred nine".