997931227 has 2 divisors, whose sum is σ = 997931228. Its totient is φ = 997931226.

The previous prime is 997931219. The next prime is 997931303. The reversal of 997931227 is 722139799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997931227 - 2³ = 997931219 is a prime.

It is not a weakly prime, because it can be changed into another prime (997931527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498965613 + 498965614.

It is an arithmetic number, because the mean of its divisors is an integer number (498965614).

Almost surely, 2^997931227 is an apocalyptic number.

997931227 is a deficient number, since it is larger than the sum of its proper divisors (1).

997931227 is an equidigital number, since it uses as much as digits as its factorization.

997931227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 997931227 is about 31590.0494934718. The cubic root of 997931227 is about 999.3099329170.

The spelling of 997931227 in words is "nine hundred ninety-seven million, nine hundred thirty-one thousand, two hundred twenty-seven".