8297991 has 32 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 4987872.

The previous prime is 8297981. The next prime is 8297999. The reversal of 8297991 is 1997928.

It is a de Polignac number, because none of the positive numbers 2^k-8297991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8297999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16246 + ... + 16748.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^8297991 is an apocalyptic number.

8297991 is a deficient number, since it is larger than the sum of its proper divisors (5249529).

8297991 is a wasteful number, since it uses less digits than its factorization.

8297991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 566 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 8297991 is about 2880.6233700364. The cubic root of 8297991 is about 202.4530480994.

The spelling of 8297991 in words is "eight million, two hundred ninety-seven thousand, nine hundred ninety-one".