218819 has 2 divisors, whose sum is σ = 218820. Its totient is φ = 218818.

The previous prime is 218809. The next prime is 218833. The reversal of 218819 is 918812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218819 - 2¹² = 214723 is a prime.

It is a super-2 number, since 2×218819² = 95763509522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 218791 and 218800.

It is not a weakly prime, because it can be changed into another prime (218809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109409 + 109410.

It is an arithmetic number, because the mean of its divisors is an integer number (109410).

2²¹⁸⁸¹⁹ is an apocalyptic number.

218819 is a deficient number, since it is larger than the sum of its proper divisors (1).

218819 is an equidigital number, since it uses as much as digits as its factorization.

218819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 29.

The square root of 218819 is about 467.7809316336. The cubic root of 218819 is about 60.2598911695.

The spelling of 218819 in words is "two hundred eighteen thousand, eight hundred nineteen".