1002221989 has 2 divisors, whose sum is σ = 1002221990. Its totient is φ = 1002221988.

The previous prime is 1002221959. The next prime is 1002222017. The reversal of 1002221989 is 9891222001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902521764 + 99700225 = 30042^2 + 9985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002221989 is a prime.

It is a super-2 number, since 2×1002221989² = 2008897830470232242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002221939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501110994 + 501110995.

It is an arithmetic number, because the mean of its divisors is an integer number (501110995).

Almost surely, 2^1002221989 is an apocalyptic number.

It is an amenable number.

1002221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002221989 is an equidigital number, since it uses as much as digits as its factorization.

1002221989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1002221989 is about 31657.8898380799. The cubic root of 1002221989 is about 1000.7401150945.

The spelling of 1002221989 in words is "one billion, two million, two hundred twenty-one thousand, nine hundred eighty-nine".