8491897 has 2 divisors, whose sum is σ = 8491898. Its totient is φ = 8491896.

The previous prime is 8491831. The next prime is 8491919. The reversal of 8491897 is 7981948.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7529536 + 962361 = 2744^2 + 981^2 .

It is a cyclic number.

It is not a de Polignac number, because 8491897 - 2¹¹ = 8489849 is a prime.

It is a super-2 number, since 2×8491897² = 144224629317218, which contains 22 as substring.

8491897 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8491817) 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, 4245948 + 4245949.

It is an arithmetic number, because the mean of its divisors is an integer number (4245949).

Almost surely, 2^8491897 is an apocalyptic number.

It is an amenable number.

8491897 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491897 is an equidigital number, since it uses as much as digits as its factorization.

8491897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 8491897 is about 2914.0859630423. The cubic root of 8491897 is about 204.0178841812.

The spelling of 8491897 in words is "eight million, four hundred ninety-one thousand, eight hundred ninety-seven".