219800491 has 2 divisors, whose sum is σ = 219800492. Its totient is φ = 219800490.

The previous prime is 219800419. The next prime is 219800513. The reversal of 219800491 is 194008912.

Together with previous prime (219800419) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 219800491 - 2¹¹ = 219798443 is a prime.

It is not a weakly prime, because it can be changed into another prime (219800291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109900245 + 109900246.

It is an arithmetic number, because the mean of its divisors is an integer number (109900246).

Almost surely, 2^219800491 is an apocalyptic number.

219800491 is a deficient number, since it is larger than the sum of its proper divisors (1).

219800491 is an equidigital number, since it uses as much as digits as its factorization.

219800491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 219800491 is about 14825.6700017234. The cubic root of 219800491 is about 603.4985339328.

The spelling of 219800491 in words is "two hundred nineteen million, eight hundred thousand, four hundred ninety-one".