219142681 has 2 divisors, whose sum is σ = 219142682. Its totient is φ = 219142680.

The previous prime is 219142661. The next prime is 219142771. The reversal of 219142681 is 186241912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216531225 + 2611456 = 14715^2 + 1616^2 .

It is a cyclic number.

It is not a de Polignac number, because 219142681 - 2⁹ = 219142169 is a prime.

It is a super-2 number, since 2×219142681² = 96047029271735522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (219142621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109571340 + 109571341.

It is an arithmetic number, because the mean of its divisors is an integer number (109571341).

Almost surely, 2^219142681 is an apocalyptic number.

It is an amenable number.

219142681 is a deficient number, since it is larger than the sum of its proper divisors (1).

219142681 is an equidigital number, since it uses as much as digits as its factorization.

219142681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 219142681 is about 14803.4685462563. The cubic root of 219142681 is about 602.8958903600.

The spelling of 219142681 in words is "two hundred nineteen million, one hundred forty-two thousand, six hundred eighty-one".