216282779 has 2 divisors, whose sum is σ = 216282780. Its totient is φ = 216282778.

The previous prime is 216282761. The next prime is 216282883. The reversal of 216282779 is 977282612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216282779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (216282379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108141389 + 108141390.

It is an arithmetic number, because the mean of its divisors is an integer number (108141390).

Almost surely, 2^216282779 is an apocalyptic number.

216282779 is a deficient number, since it is larger than the sum of its proper divisors (1).

216282779 is an equidigital number, since it uses as much as digits as its factorization.

216282779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 216282779 is about 14706.5556470575. Note that the first 3 decimals coincide. The cubic root of 216282779 is about 600.2617182301.

The spelling of 216282779 in words is "two hundred sixteen million, two hundred eighty-two thousand, seven hundred seventy-nine".