997918223 has 2 divisors, whose sum is σ = 997918224. Its totient is φ = 997918222.

The previous prime is 997918193. The next prime is 997918289. The reversal of 997918223 is 322819799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997918223 - 2¹⁰ = 997917199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997918123) 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, 498959111 + 498959112.

It is an arithmetic number, because the mean of its divisors is an integer number (498959112).

Almost surely, 2^997918223 is an apocalyptic number.

997918223 is a deficient number, since it is larger than the sum of its proper divisors (1).

997918223 is an equidigital number, since it uses as much as digits as its factorization.

997918223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 997918223 is about 31589.8436684957. The cubic root of 997918223 is about 999.3055922428.

The spelling of 997918223 in words is "nine hundred ninety-seven million, nine hundred eighteen thousand, two hundred twenty-three".