997109 has 2 divisors, whose sum is σ = 997110. Its totient is φ = 997108.

The previous prime is 997103. The next prime is 997111. The reversal of 997109 is 901799.

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., 819025 + 178084 = 905^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 997109 - 2¹⁶ = 931573 is a prime.

Together with 997111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498554 + 498555.

It is an arithmetic number, because the mean of its divisors is an integer number (498555).

2⁹⁹⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

997109 is a deficient number, since it is larger than the sum of its proper divisors (1).

997109 is an equidigital number, since it uses as much as digits as its factorization.

997109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 997109 is about 998.5534537520. The cubic root of 997109 is about 99.9035403185.

The spelling of 997109 in words is "nine hundred ninety-seven thousand, one hundred nine".