999363221 has 2 divisors, whose sum is σ = 999363222. Its totient is φ = 999363220.

The previous prime is 999363217. The next prime is 999363227. The reversal of 999363221 is 122363999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 957902500 + 41460721 = 30950^2 + 6439^2 .

It is a cyclic number.

It is not a de Polignac number, because 999363221 - 2² = 999363217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999363227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499681610 + 499681611.

It is an arithmetic number, because the mean of its divisors is an integer number (499681611).

Almost surely, 2^999363221 is an apocalyptic number.

It is an amenable number.

999363221 is a deficient number, since it is larger than the sum of its proper divisors (1).

999363221 is an equidigital number, since it uses as much as digits as its factorization.

999363221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 999363221 is about 31612.7066383124. The cubic root of 999363221 is about 999.7876952632.

The spelling of 999363221 in words is "nine hundred ninety-nine million, three hundred sixty-three thousand, two hundred twenty-one".