216363761 has 2 divisors, whose sum is σ = 216363762. Its totient is φ = 216363760.

The previous prime is 216363731. The next prime is 216363779. The reversal of 216363761 is 167363612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216237025 + 126736 = 14705^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 216363761 - 2¹⁰ = 216362737 is a prime.

It is not a weakly prime, because it can be changed into another prime (216363731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108181880 + 108181881.

It is an arithmetic number, because the mean of its divisors is an integer number (108181881).

Almost surely, 2^216363761 is an apocalyptic number.

It is an amenable number.

216363761 is a deficient number, since it is larger than the sum of its proper divisors (1).

216363761 is an equidigital number, since it uses as much as digits as its factorization.

216363761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 216363761 is about 14709.3086513269. The cubic root of 216363761 is about 600.3366268427.

The spelling of 216363761 in words is "two hundred sixteen million, three hundred sixty-three thousand, seven hundred sixty-one".