8497991 has 2 divisors, whose sum is σ = 8497992. Its totient is φ = 8497990.

The previous prime is 8497969. The next prime is 8498051. The reversal of 8497991 is 1997948.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8497991 - 2⁶ = 8497927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8497091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4248995 + 4248996.

It is an arithmetic number, because the mean of its divisors is an integer number (4248996).

Almost surely, 2^8497991 is an apocalyptic number.

8497991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8497991 is an equidigital number, since it uses as much as digits as its factorization.

8497991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 8497991 is about 2915.1313864044. The cubic root of 8497991 is about 204.0666753092.

The spelling of 8497991 in words is "eight million, four hundred ninety-seven thousand, nine hundred ninety-one".