220308161 has 2 divisors, whose sum is σ = 220308162. Its totient is φ = 220308160.

The previous prime is 220308139. The next prime is 220308163. The reversal of 220308161 is 161803022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189227536 + 31080625 = 13756^2 + 5575^2 .

It is a cyclic number.

It is not a de Polignac number, because 220308161 - 2²² = 216113857 is a prime.

Together with 220308163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220308163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110154080 + 110154081.

It is an arithmetic number, because the mean of its divisors is an integer number (110154081).

Almost surely, 2^220308161 is an apocalyptic number.

It is an amenable number.

220308161 is a deficient number, since it is larger than the sum of its proper divisors (1).

220308161 is an equidigital number, since it uses as much as digits as its factorization.

220308161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 220308161 is about 14842.7814441903. The cubic root of 220308161 is about 603.9628072723.

The spelling of 220308161 in words is "two hundred twenty million, three hundred eight thousand, one hundred sixty-one".