219771089 has 2 divisors, whose sum is σ = 219771090. Its totient is φ = 219771088.

The previous prime is 219771061. The next prime is 219771113. The reversal of 219771089 is 980177912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164044864 + 55726225 = 12808^2 + 7465^2 .

It is a cyclic number.

It is not a de Polignac number, because 219771089 - 2¹² = 219766993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (219771589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109885544 + 109885545.

It is an arithmetic number, because the mean of its divisors is an integer number (109885545).

Almost surely, 2^219771089 is an apocalyptic number.

It is an amenable number.

219771089 is a deficient number, since it is larger than the sum of its proper divisors (1).

219771089 is an equidigital number, since it uses as much as digits as its factorization.

219771089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 219771089 is about 14824.6783776243. The cubic root of 219771089 is about 603.4716233846.

The spelling of 219771089 in words is "two hundred nineteen million, seven hundred seventy-one thousand, eighty-nine".