216609611 has 2 divisors, whose sum is σ = 216609612. Its totient is φ = 216609610.

The previous prime is 216609571. The next prime is 216609643. The reversal of 216609611 is 116906612.

It is an a-pointer prime, because the next prime (216609643) can be obtained adding 216609611 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216609611 is a prime.

It is not a weakly prime, because it can be changed into another prime (216639611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108304805 + 108304806.

It is an arithmetic number, because the mean of its divisors is an integer number (108304806).

Almost surely, 2^216609611 is an apocalyptic number.

216609611 is a deficient number, since it is larger than the sum of its proper divisors (1).

216609611 is an equidigital number, since it uses as much as digits as its factorization.

216609611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 216609611 is about 14717.6632316411. The cubic root of 216609611 is about 600.5639244456.

The spelling of 216609611 in words is "two hundred sixteen million, six hundred nine thousand, six hundred eleven".