8361991 has 8 divisors (see below), whose sum is σ = 9345168. Its totient is φ = 7416000.

The previous prime is 8361979. The next prime is 8362021. The reversal of 8361991 is 1991638.

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 8361991 - 2¹⁹ = 7837703 is a prime.

It is a Duffinian 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 8361991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8361901) 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, 8820 + ... + 9721.

It is an arithmetic number, because the mean of its divisors is an integer number (1168146).

Almost surely, 2^8361991 is an apocalyptic number.

8361991 is a deficient number, since it is larger than the sum of its proper divisors (983177).

8361991 is a wasteful number, since it uses less digits than its factorization.

8361991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18593.

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

The square root of 8361991 is about 2891.7107393375. The cubic root of 8361991 is about 202.9722029125.

The spelling of 8361991 in words is "eight million, three hundred sixty-one thousand, nine hundred ninety-one".