8228991 has 8 divisors (see below), whose sum is σ = 11006464. Its totient is φ = 5468760.

The previous prime is 8228989. The next prime is 8228993. The reversal of 8228991 is 1998228.

It is an interprime number because it is at equal distance from previous prime (8228989) and next prime (8228993).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8228991 - 2¹ = 8228989 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 (8228993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3151 + ... + 5136.

It is an arithmetic number, because the mean of its divisors is an integer number (1375808).

Almost surely, 2^8228991 is an apocalyptic number.

8228991 is a deficient number, since it is larger than the sum of its proper divisors (2777473).

8228991 is a wasteful number, since it uses less digits than its factorization.

8228991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621.

The product of its digits is 20736, while the sum is 39.

The square root of 8228991 is about 2868.6217945208. The cubic root of 8228991 is about 201.8903352068.

The spelling of 8228991 in words is "eight million, two hundred twenty-eight thousand, nine hundred ninety-one".