8191039 has 4 divisors (see below), whose sum is σ = 8232400. Its totient is φ = 8149680.

The previous prime is 8190997. The next prime is 8191049. The reversal of 8191039 is 9301918.

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 8191039 - 2¹³ = 8182847 is a prime.

It is a Duffinian number.

8191039 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 8191039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191049) 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, 20382 + ... + 20779.

It is an arithmetic number, because the mean of its divisors is an integer number (2058100).

Almost surely, 2^8191039 is an apocalyptic number.

8191039 is a deficient number, since it is larger than the sum of its proper divisors (41361).

8191039 is a wasteful number, since it uses less digits than its factorization.

8191039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41360.

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

The square root of 8191039 is about 2861.9991264848. Note that the first 3 decimals coincide. The cubic root of 8191039 is about 201.5794849657.

The spelling of 8191039 in words is "eight million, one hundred ninety-one thousand, thirty-nine".