997447697 has 2 divisors, whose sum is σ = 997447698. Its totient is φ = 997447696.

The previous prime is 997447679. The next prime is 997447699. The reversal of 997447697 is 796744799.

Together with previous prime (997447679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829382401 + 168065296 = 28799^2 + 12964^2 .

It is a cyclic number.

It is not a de Polignac number, because 997447697 - 2⁸ = 997447441 is a prime.

Together with 997447699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997447699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498723848 + 498723849.

It is an arithmetic number, because the mean of its divisors is an integer number (498723849).

Almost surely, 2^997447697 is an apocalyptic number.

It is an amenable number.

997447697 is a deficient number, since it is larger than the sum of its proper divisors (1).

997447697 is an equidigital number, since it uses as much as digits as its factorization.

997447697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24004512, while the sum is 62.

The square root of 997447697 is about 31582.3953651397. The cubic root of 997447697 is about 999.1485074996.

The spelling of 997447697 in words is "nine hundred ninety-seven million, four hundred forty-seven thousand, six hundred ninety-seven".