220209697 has 2 divisors, whose sum is σ = 220209698. Its totient is φ = 220209696.

The previous prime is 220209643. The next prime is 220209701. The reversal of 220209697 is 796902022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217887121 + 2322576 = 14761^2 + 1524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220209697 is a prime.

It is not a weakly prime, because it can be changed into another prime (220209397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110104848 + 110104849.

It is an arithmetic number, because the mean of its divisors is an integer number (110104849).

Almost surely, 2^220209697 is an apocalyptic number.

It is an amenable number.

220209697 is a deficient number, since it is larger than the sum of its proper divisors (1).

220209697 is an equidigital number, since it uses as much as digits as its factorization.

220209697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 220209697 is about 14839.4641749627. The cubic root of 220209697 is about 603.8728159689.

The spelling of 220209697 in words is "two hundred twenty million, two hundred nine thousand, six hundred ninety-seven".