999644227 has 2 divisors, whose sum is σ = 999644228. Its totient is φ = 999644226.

The previous prime is 999644209. The next prime is 999644231. The reversal of 999644227 is 722446999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999644227 is a prime.

It is not a weakly prime, because it can be changed into another prime (999644827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499822113 + 499822114.

It is an arithmetic number, because the mean of its divisors is an integer number (499822114).

Almost surely, 2^999644227 is an apocalyptic number.

999644227 is a deficient number, since it is larger than the sum of its proper divisors (1).

999644227 is an equidigital number, since it uses as much as digits as its factorization.

999644227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 52.

The square root of 999644227 is about 31617.1508362155. The cubic root of 999644227 is about 999.8813949334.

The spelling of 999644227 in words is "nine hundred ninety-nine million, six hundred forty-four thousand, two hundred twenty-seven".