220689691 has 2 divisors, whose sum is σ = 220689692. Its totient is φ = 220689690.

The previous prime is 220689683. The next prime is 220689697. The reversal of 220689691 is 196986022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220689691 - 2³ = 220689683 is a prime.

It is not a weakly prime, because it can be changed into another prime (220689697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110344845 + 110344846.

It is an arithmetic number, because the mean of its divisors is an integer number (110344846).

Almost surely, 2^220689691 is an apocalyptic number.

220689691 is a deficient number, since it is larger than the sum of its proper divisors (1).

220689691 is an equidigital number, since it uses as much as digits as its factorization.

220689691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 220689691 is about 14855.6282600232. The cubic root of 220689691 is about 604.3112540979.

The spelling of 220689691 in words is "two hundred twenty million, six hundred eighty-nine thousand, six hundred ninety-one".