219052661 has 2 divisors, whose sum is σ = 219052662. Its totient is φ = 219052660.

The previous prime is 219052651. The next prime is 219052693. The reversal of 219052661 is 166250912.

It is a happy number.

It is an a-pointer prime, because the next prime (219052693) can be obtained adding 219052661 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178730161 + 40322500 = 13369^2 + 6350^2 .

It is a cyclic number.

It is not a de Polignac number, because 219052661 - 2¹⁴ = 219036277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219052651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109526330 + 109526331.

It is an arithmetic number, because the mean of its divisors is an integer number (109526331).

Almost surely, 2^219052661 is an apocalyptic number.

It is an amenable number.

219052661 is a deficient number, since it is larger than the sum of its proper divisors (1).

219052661 is an equidigital number, since it uses as much as digits as its factorization.

219052661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 219052661 is about 14800.4277303056. The cubic root of 219052661 is about 602.8133260067.

The spelling of 219052661 in words is "two hundred nineteen million, fifty-two thousand, six hundred sixty-one".