220689697 has 2 divisors, whose sum is σ = 220689698. Its totient is φ = 220689696.

The previous prime is 220689691. The next prime is 220689701. The reversal of 220689697 is 796986022.

220689697 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., 215473041 + 5216656 = 14679^2 + 2284^2 .

It is a cyclic number.

It is not a de Polignac number, because 220689697 - 2⁷ = 220689569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220689697.

It is not a weakly prime, because it can be changed into another prime (220689691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110344848 + 110344849.

It is an arithmetic number, because the mean of its divisors is an integer number (110344849).

Almost surely, 2^220689697 is an apocalyptic number.

It is an amenable number.

220689697 is a deficient number, since it is larger than the sum of its proper divisors (1).

220689697 is an equidigital number, since it uses as much as digits as its factorization.

220689697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 220689697 is about 14855.6284619669. The cubic root of 220689697 is about 604.3112595744.

The spelling of 220689697 in words is "two hundred twenty million, six hundred eighty-nine thousand, six hundred ninety-seven".