997209071 has 2 divisors, whose sum is σ = 997209072. Its totient is φ = 997209070.

The previous prime is 997209047. The next prime is 997209131. The reversal of 997209071 is 170902799.

It is a weak prime.

It is an emirp because it is prime and its reverse (170902799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997209071 - 2⁶ = 997209007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997209671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498604535 + 498604536.

It is an arithmetic number, because the mean of its divisors is an integer number (498604536).

Almost surely, 2^997209071 is an apocalyptic number.

997209071 is a deficient number, since it is larger than the sum of its proper divisors (1).

997209071 is an equidigital number, since it uses as much as digits as its factorization.

997209071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 997209071 is about 31578.6173066523. The cubic root of 997209071 is about 999.0688235128.

The spelling of 997209071 in words is "nine hundred ninety-seven million, two hundred nine thousand, seventy-one".