219276989 has 2 divisors, whose sum is σ = 219276990. Its totient is φ = 219276988.

The previous prime is 219276973. The next prime is 219276991. The reversal of 219276989 is 989672912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128074489 + 91202500 = 11317^2 + 9550^2 .

It is a cyclic number.

It is not a de Polignac number, because 219276989 - 2⁴ = 219276973 is a prime.

It is a super-2 number, since 2×219276989² = 96164795809812242, which contains 22 as substring.

Together with 219276991, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 219276989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219278989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109638494 + 109638495.

It is an arithmetic number, because the mean of its divisors is an integer number (109638495).

Almost surely, 2^219276989 is an apocalyptic number.

It is an amenable number.

219276989 is a deficient number, since it is larger than the sum of its proper divisors (1).

219276989 is an equidigital number, since it uses as much as digits as its factorization.

219276989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 219276989 is about 14808.0042206909. The cubic root of 219276989 is about 603.0190326648.

The spelling of 219276989 in words is "two hundred nineteen million, two hundred seventy-six thousand, nine hundred eighty-nine".