220761689 has 2 divisors, whose sum is σ = 220761690. Its totient is φ = 220761688.

The previous prime is 220761683. The next prime is 220761713. The reversal of 220761689 is 986167022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150872089 + 69889600 = 12283^2 + 8360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220761689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220761683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110380844 + 110380845.

It is an arithmetic number, because the mean of its divisors is an integer number (110380845).

Almost surely, 2^220761689 is an apocalyptic number.

It is an amenable number.

220761689 is a deficient number, since it is larger than the sum of its proper divisors (1).

220761689 is an equidigital number, since it uses as much as digits as its factorization.

220761689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 220761689 is about 14858.0513190660. The cubic root of 220761689 is about 604.3769639653.

The spelling of 220761689 in words is "two hundred twenty million, seven hundred sixty-one thousand, six hundred eighty-nine".