219808931 has 2 divisors, whose sum is σ = 219808932. Its totient is φ = 219808930.

The previous prime is 219808903. The next prime is 219808973. The reversal of 219808931 is 139808912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 219808931 - 2¹⁸ = 219546787 is a prime.

It is a super-2 number, since 2×219808931² = 96631932294725522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (219808031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109904465 + 109904466.

It is an arithmetic number, because the mean of its divisors is an integer number (109904466).

Almost surely, 2^219808931 is an apocalyptic number.

219808931 is a deficient number, since it is larger than the sum of its proper divisors (1).

219808931 is an equidigital number, since it uses as much as digits as its factorization.

219808931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 219808931 is about 14825.9546404270. The cubic root of 219808931 is about 603.5062583050.

The spelling of 219808931 in words is "two hundred nineteen million, eight hundred eight thousand, nine hundred thirty-one".