219797 has 2 divisors, whose sum is σ = 219798. Its totient is φ = 219796.

The previous prime is 219787. The next prime is 219799. The reversal of 219797 is 797912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111556 + 108241 = 334^2 + 329^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219797 is a prime.

Together with 219799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109898 + 109899.

It is an arithmetic number, because the mean of its divisors is an integer number (109899).

2²¹⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

219797 is a deficient number, since it is larger than the sum of its proper divisors (1).

219797 is an equidigital number, since it uses as much as digits as its factorization.

219797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938, while the sum is 35.

The square root of 219797 is about 468.8251273129. The cubic root of 219797 is about 60.3495338877.

The spelling of 219797 in words is "two hundred nineteen thousand, seven hundred ninety-seven".