997070909 has 2 divisors, whose sum is σ = 997070910. Its totient is φ = 997070908.

The previous prime is 997070897. The next prime is 997070917. The reversal of 997070909 is 909070799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988788025 + 8282884 = 31445^2 + 2878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997070909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997070939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498535454 + 498535455.

It is an arithmetic number, because the mean of its divisors is an integer number (498535455).

Almost surely, 2^997070909 is an apocalyptic number.

It is an amenable number.

997070909 is a deficient number, since it is larger than the sum of its proper divisors (1).

997070909 is an equidigital number, since it uses as much as digits as its factorization.

997070909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 321489, while the sum is 50.

The square root of 997070909 is about 31576.4296430106. The cubic root of 997070909 is about 999.0226814930.

The spelling of 997070909 in words is "nine hundred ninety-seven million, seventy thousand, nine hundred nine".