143221989 has 12 divisors (see below), whose sum is σ = 199628576. Its totient is φ = 91328952.

The previous prime is 143221951. The next prime is 143222021. The reversal of 143221989 is 989122341.

It is not a de Polignac number, because 143221989 - 2²³ = 134833381 is a prime.

It is a super-2 number, since 2×143221989² = 41025076266232242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143221909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43537 + ... + 46710.

Almost surely, 2^143221989 is an apocalyptic number.

It is an amenable number.

143221989 is a deficient number, since it is larger than the sum of its proper divisors (56406587).

143221989 is an equidigital number, since it uses as much as digits as its factorization.

143221989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90296 (or 90273 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 143221989 is about 11967.5389700640. The cubic root of 143221989 is about 523.2026081137.

The spelling of 143221989 in words is "one hundred forty-three million, two hundred twenty-one thousand, nine hundred eighty-nine".