223812161 has 4 divisors (see below), whose sum is σ = 224221872. Its totient is φ = 223402452.

The previous prime is 223812151. The next prime is 223812209. The reversal of 223812161 is 161218322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161218322 = 2 ⋅80609161.

It is a cyclic number.

It is not a de Polignac number, because 223812161 - 2¹⁴ = 223795777 is a prime.

It is a super-2 number, since 2×223812161² = 100183766822979842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 223812161.

It is not an unprimeable number, because it can be changed into a prime (223812151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204035 + ... + 205128.

It is an arithmetic number, because the mean of its divisors is an integer number (56055468).

Almost surely, 2^223812161 is an apocalyptic number.

It is an amenable number.

223812161 is a deficient number, since it is larger than the sum of its proper divisors (409711).

223812161 is an equidigital number, since it uses as much as digits as its factorization.

223812161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409710.

The product of its digits is 1152, while the sum is 26.

The square root of 223812161 is about 14960.3529704349. The cubic root of 223812161 is about 607.1479880219.

It can be divided in two parts, 22381 and 2161, that added together give a palindrome (24542).

The spelling of 223812161 in words is "two hundred twenty-three million, eight hundred twelve thousand, one hundred sixty-one".