247997 has 2 divisors, whose sum is σ = 247998. Its totient is φ = 247996.

The previous prime is 247993. The next prime is 247999. The reversal of 247997 is 799742.

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., 177241 + 70756 = 421^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 247997 - 2² = 247993 is a prime.

Together with 247999, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 247997.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 247997.

It is not a weakly prime, because it can be changed into another prime (247991) 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, 123998 + 123999.

It is an arithmetic number, because the mean of its divisors is an integer number (123999).

2²⁴⁷⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

247997 is a deficient number, since it is larger than the sum of its proper divisors (1).

247997 is an equidigital number, since it uses as much as digits as its factorization.

247997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 247997 is about 497.9929718380. The cubic root of 247997 is about 62.8273597097.

The spelling of 247997 in words is "two hundred forty-seven thousand, nine hundred ninety-seven".