216678479 has 2 divisors, whose sum is σ = 216678480. Its totient is φ = 216678478.

The previous prime is 216678463. The next prime is 216678509. The reversal of 216678479 is 974876612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216678479 - 2⁴ = 216678463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216678409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108339239 + 108339240.

It is an arithmetic number, because the mean of its divisors is an integer number (108339240).

Almost surely, 2^216678479 is an apocalyptic number.

216678479 is a deficient number, since it is larger than the sum of its proper divisors (1).

216678479 is an equidigital number, since it uses as much as digits as its factorization.

216678479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 216678479 is about 14720.0026834237. The cubic root of 216678479 is about 600.6275646718.

The spelling of 216678479 in words is "two hundred sixteen million, six hundred seventy-eight thousand, four hundred seventy-nine".