216636047 has 2 divisors, whose sum is σ = 216636048. Its totient is φ = 216636046.

The previous prime is 216636031. The next prime is 216636109. The reversal of 216636047 is 740636612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216636047 - 2⁴ = 216636031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216635998 and 216636016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216636247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108318023 + 108318024.

It is an arithmetic number, because the mean of its divisors is an integer number (108318024).

Almost surely, 2^216636047 is an apocalyptic number.

216636047 is a deficient number, since it is larger than the sum of its proper divisors (1).

216636047 is an equidigital number, since it uses as much as digits as its factorization.

216636047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 216636047 is about 14718.5613087693. The cubic root of 216636047 is about 600.5883552823.

The spelling of 216636047 in words is "two hundred sixteen million, six hundred thirty-six thousand, forty-seven".