220365161 has 2 divisors, whose sum is σ = 220365162. Its totient is φ = 220365160.

The previous prime is 220365137. The next prime is 220365163. The reversal of 220365161 is 161563022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113635600 + 106729561 = 10660^2 + 10331^2 .

It is a cyclic number.

It is not a de Polignac number, because 220365161 - 2¹⁸ = 220103017 is a prime.

Together with 220365163, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12141494 and since 220365161 and 12141494 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220365161.

It is not a weakly prime, because it can be changed into another prime (220365163) 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, 110182580 + 110182581.

It is an arithmetic number, because the mean of its divisors is an integer number (110182581).

Almost surely, 2^220365161 is an apocalyptic number.

It is an amenable number.

220365161 is a deficient number, since it is larger than the sum of its proper divisors (1).

220365161 is an equidigital number, since it uses as much as digits as its factorization.

220365161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 220365161 is about 14844.7014452969. The cubic root of 220365161 is about 604.0148902444.

The spelling of 220365161 in words is "two hundred twenty million, three hundred sixty-five thousand, one hundred sixty-one".