1000220999 has 2 divisors, whose sum is σ = 1000221000. Its totient is φ = 1000220998.

The previous prime is 1000220927. The next prime is 1000221007. The reversal of 1000220999 is 9990220001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000220999 - 2²⁰ = 999172423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000210999) 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, 500110499 + 500110500.

It is an arithmetic number, because the mean of its divisors is an integer number (500110500).

Almost surely, 2^1000220999 is an apocalyptic number.

1000220999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000220999 is an equidigital number, since it uses as much as digits as its factorization.

1000220999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1000220999 is about 31626.2707096490. The cubic root of 1000220999 is about 1000.0736609073.

The spelling of 1000220999 in words is "one billion, two hundred twenty thousand, nine hundred ninety-nine".