219678081 has 16 divisors (see below), whose sum is σ = 334992384. Its totient is φ = 125438544.

The previous prime is 219678079. The next prime is 219678089. The reversal of 219678081 is 180876912.

It is not a de Polignac number, because 219678081 - 2¹ = 219678079 is a prime.

It is a super-2 number, since 2×219678081² = 96516918543685122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (219678089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34510 + ... + 40376.

It is an arithmetic number, because the mean of its divisors is an integer number (20937024).

Almost surely, 2^219678081 is an apocalyptic number.

219678081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

219678081 is a deficient number, since it is larger than the sum of its proper divisors (115314303).

219678081 is a wasteful number, since it uses less digits than its factorization.

219678081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 219678081 is about 14821.5411142027. The cubic root of 219678081 is about 603.3864808412.

The spelling of 219678081 in words is "two hundred nineteen million, six hundred seventy-eight thousand, eighty-one".