8241991 has 18 divisors (see below), whose sum is σ = 9357360. Its totient is φ = 7255872.

The previous prime is 8241979. The next prime is 8242007. The reversal of 8241991 is 1991428.

It is not a de Polignac number, because 8241991 - 2⁹ = 8241479 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

8241991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8241901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 104290 + ... + 104368.

Almost surely, 2^8241991 is an apocalyptic number.

8241991 is a deficient number, since it is larger than the sum of its proper divisors (1115369).

8241991 is a wasteful number, since it uses less digits than its factorization.

8241991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 115 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 8241991 is about 2870.8867967929. The cubic root of 8241991 is about 201.9965934138.

The spelling of 8241991 in words is "eight million, two hundred forty-one thousand, nine hundred ninety-one".