216036761 has 2 divisors, whose sum is σ = 216036762. Its totient is φ = 216036760.

The previous prime is 216036683. The next prime is 216036767. The reversal of 216036761 is 167630612.

216036761 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 can be written as a sum of positive squares in only one way, i.e., 215502400 + 534361 = 14680^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 216036761 - 2¹⁰ = 216035737 is a prime.

It is a super-2 number, since 2×216036761² = 93343764206742242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216036767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108018380 + 108018381.

It is an arithmetic number, because the mean of its divisors is an integer number (108018381).

Almost surely, 2^216036761 is an apocalyptic number.

It is an amenable number.

216036761 is a deficient number, since it is larger than the sum of its proper divisors (1).

216036761 is an equidigital number, since it uses as much as digits as its factorization.

216036761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 216036761 is about 14698.1890381094. The cubic root of 216036761 is about 600.0340360322.

The spelling of 216036761 in words is "two hundred sixteen million, thirty-six thousand, seven hundred sixty-one".