219789987061 has 2 divisors, whose sum is σ = 219789987062. Its totient is φ = 219789987060.

The previous prime is 219789987037. The next prime is 219789987089. The reversal of 219789987061 is 160789987912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114975924561 + 104814062500 = 339081^2 + 323750^2 .

It is a cyclic number.

It is not a de Polignac number, because 219789987061 - 2¹³ = 219789978869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219789907061) 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, 109894993530 + 109894993531.

It is an arithmetic number, because the mean of its divisors is an integer number (109894993531).

Almost surely, 2^219789987061 is an apocalyptic number.

It is an amenable number.

219789987061 is a deficient number, since it is larger than the sum of its proper divisors (1).

219789987061 is an equidigital number, since it uses as much as digits as its factorization.

219789987061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 67.

The spelling of 219789987061 in words is "two hundred nineteen billion, seven hundred eighty-nine million, nine hundred eighty-seven thousand, sixty-one".