220331989 has 2 divisors, whose sum is σ = 220331990. Its totient is φ = 220331988.

The previous prime is 220331987. The next prime is 220332017. The reversal of 220331989 is 989133022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121727089 + 98604900 = 11033^2 + 9930^2 .

It is a cyclic number.

It is not a de Polignac number, because 220331989 - 2¹ = 220331987 is a prime.

It is a super-2 number, since 2×220331989² = 97092370753392242, which contains 22 as substring.

Together with 220331987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220331987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110165994 + 110165995.

It is an arithmetic number, because the mean of its divisors is an integer number (110165995).

Almost surely, 2^220331989 is an apocalyptic number.

It is an amenable number.

220331989 is a deficient number, since it is larger than the sum of its proper divisors (1).

220331989 is an equidigital number, since it uses as much as digits as its factorization.

220331989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 220331989 is about 14843.5841022308. The cubic root of 220331989 is about 603.9845808747.

The spelling of 220331989 in words is "two hundred twenty million, three hundred thirty-one thousand, nine hundred eighty-nine".