216089947 has 2 divisors, whose sum is σ = 216089948. Its totient is φ = 216089946.

The previous prime is 216089903. The next prime is 216089959. The reversal of 216089947 is 749980612.

216089947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216089947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216089897 and 216089906.

It is not a weakly prime, because it can be changed into another prime (216089647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108044973 + 108044974.

It is an arithmetic number, because the mean of its divisors is an integer number (108044974).

Almost surely, 2^216089947 is an apocalyptic number.

216089947 is a deficient number, since it is larger than the sum of its proper divisors (1).

216089947 is an equidigital number, since it uses as much as digits as its factorization.

216089947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 216089947 is about 14699.9981972788. The cubic root of 216089947 is about 600.0832727015.

The spelling of 216089947 in words is "two hundred sixteen million, eighty-nine thousand, nine hundred forty-seven".