219985919 has 2 divisors, whose sum is σ = 219985920. Its totient is φ = 219985918.

The previous prime is 219985891. The next prime is 219985937. The reversal of 219985919 is 919589912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 219985919 - 2⁸ = 219985663 is a prime.

It is a super-2 number, since 2×219985919² = 96787609116549122, which contains 22 as substring.

It is a Sophie Germain 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 (219985949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109992959 + 109992960.

It is an arithmetic number, because the mean of its divisors is an integer number (109992960).

Almost surely, 2^219985919 is an apocalyptic number.

219985919 is a deficient number, since it is larger than the sum of its proper divisors (1).

219985919 is an equidigital number, since it uses as much as digits as its factorization.

219985919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 53.

The square root of 219985919 is about 14831.9222961826. The cubic root of 219985919 is about 603.6681939607.

The spelling of 219985919 in words is "two hundred nineteen million, nine hundred eighty-five thousand, nine hundred nineteen".