8103991 has 4 divisors (see below), whose sum is σ = 9261712. Its totient is φ = 6946272.

The previous prime is 8103983. The next prime is 8104007. The reversal of 8103991 is 1993018.

8103991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 8103991 - 2³ = 8103983 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 (8103941) 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, 578850 + ... + 578863.

It is an arithmetic number, because the mean of its divisors is an integer number (2315428).

Almost surely, 2^8103991 is an apocalyptic number.

8103991 is a deficient number, since it is larger than the sum of its proper divisors (1157721).

8103991 is a wasteful number, since it uses less digits than its factorization.

8103991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157720.

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

The square root of 8103991 is about 2846.7509550363. The cubic root of 8103991 is about 200.8628636447.

The spelling of 8103991 in words is "eight million, one hundred three thousand, nine hundred ninety-one".