216388651 has 2 divisors, whose sum is σ = 216388652. Its totient is φ = 216388650.

The previous prime is 216388621. The next prime is 216388681. The reversal of 216388651 is 156883612.

It is a balanced prime because it is at equal distance from previous prime (216388621) and next prime (216388681).

It is a cyclic number.

It is not a de Polignac number, because 216388651 - 2⁵ = 216388619 is a prime.

It is not a weakly prime, because it can be changed into another prime (216388621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108194325 + 108194326.

It is an arithmetic number, because the mean of its divisors is an integer number (108194326).

Almost surely, 2^216388651 is an apocalyptic number.

216388651 is a deficient number, since it is larger than the sum of its proper divisors (1).

216388651 is an equidigital number, since it uses as much as digits as its factorization.

216388651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 216388651 is about 14710.1546898733. The cubic root of 216388651 is about 600.3596464181.

The spelling of 216388651 in words is "two hundred sixteen million, three hundred eighty-eight thousand, six hundred fifty-one".