997376909 has 2 divisors, whose sum is σ = 997376910. Its totient is φ = 997376908.

The previous prime is 997376869. The next prime is 997376917. The reversal of 997376909 is 909673799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 741472900 + 255904009 = 27230^2 + 15997^2 .

It is an emirp because it is prime and its reverse (909673799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997376909 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 (997376969) 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, 498688454 + 498688455.

It is an arithmetic number, because the mean of its divisors is an integer number (498688455).

Almost surely, 2^997376909 is an apocalyptic number.

It is an amenable number.

997376909 is a deficient number, since it is larger than the sum of its proper divisors (1).

997376909 is an equidigital number, since it uses as much as digits as its factorization.

997376909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5786802, while the sum is 59.

The square root of 997376909 is about 31581.2746576195. The cubic root of 997376909 is about 999.1248707055.

The spelling of 997376909 in words is "nine hundred ninety-seven million, three hundred seventy-six thousand, nine hundred nine".