219988009 has 2 divisors, whose sum is σ = 219988010. Its totient is φ = 219988008.

The previous prime is 219987991. The next prime is 219988037. The reversal of 219988009 is 900889912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158835609 + 61152400 = 12603^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 219988009 - 2¹³ = 219979817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 219988009.

It is not a weakly prime, because it can be changed into another prime (219988079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109994004 + 109994005.

It is an arithmetic number, because the mean of its divisors is an integer number (109994005).

Almost surely, 2^219988009 is an apocalyptic number.

It is an amenable number.

219988009 is a deficient number, since it is larger than the sum of its proper divisors (1).

219988009 is an equidigital number, since it uses as much as digits as its factorization.

219988009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 219988009 is about 14831.9927521557. The cubic root of 219988009 is about 603.6701056930.

The spelling of 219988009 in words is "two hundred nineteen million, nine hundred eighty-eight thousand, nine".