219128629 has 2 divisors, whose sum is σ = 219128630. Its totient is φ = 219128628.

The previous prime is 219128627. The next prime is 219128647. The reversal of 219128629 is 926821912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213101604 + 6027025 = 14598^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 219128629 - 2¹ = 219128627 is a prime.

Together with 219128627, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 219128591 and 219128600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219128627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109564314 + 109564315.

It is an arithmetic number, because the mean of its divisors is an integer number (109564315).

Almost surely, 2^219128629 is an apocalyptic number.

It is an amenable number.

219128629 is a deficient number, since it is larger than the sum of its proper divisors (1).

219128629 is an equidigital number, since it uses as much as digits as its factorization.

219128629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 219128629 is about 14802.9939201501. The cubic root of 219128629 is about 602.8830036658.

The spelling of 219128629 in words is "two hundred nineteen million, one hundred twenty-eight thousand, six hundred twenty-nine".