223656161 has 2 divisors, whose sum is σ = 223656162. Its totient is φ = 223656160.

The previous prime is 223656151. The next prime is 223656187. The reversal of 223656161 is 161656322.

223656161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152152225 + 71503936 = 12335^2 + 8456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223656161 is a prime.

It is not a weakly prime, because it can be changed into another prime (223656151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111828080 + 111828081.

It is an arithmetic number, because the mean of its divisors is an integer number (111828081).

Almost surely, 2^223656161 is an apocalyptic number.

It is an amenable number.

223656161 is a deficient number, since it is larger than the sum of its proper divisors (1).

223656161 is an equidigital number, since it uses as much as digits as its factorization.

223656161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 223656161 is about 14955.1382808719. The cubic root of 223656161 is about 607.0068918751.

The spelling of 223656161 in words is "two hundred twenty-three million, six hundred fifty-six thousand, one hundred sixty-one".