216678701 has 2 divisors, whose sum is σ = 216678702. Its totient is φ = 216678700.

The previous prime is 216678689. The next prime is 216678703. The reversal of 216678701 is 107876612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180257476 + 36421225 = 13426^2 + 6035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216678701 is a prime.

Together with 216678703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216678703) 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, 108339350 + 108339351.

It is an arithmetic number, because the mean of its divisors is an integer number (108339351).

Almost surely, 2^216678701 is an apocalyptic number.

It is an amenable number.

216678701 is a deficient number, since it is larger than the sum of its proper divisors (1).

216678701 is an equidigital number, since it uses as much as digits as its factorization.

216678701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 216678701 is about 14720.0102241812. The cubic root of 216678701 is about 600.6277697979.

The spelling of 216678701 in words is "two hundred sixteen million, six hundred seventy-eight thousand, seven hundred one".