323220161 has 6 divisors (see below), whose sum is σ = 355275186. Its totient is φ = 293836400.

The previous prime is 323220137. The next prime is 323220223. The reversal of 323220161 is 161022323.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 263250625 + 59969536 = 16225^2 + 7744^2 .

It is not a de Polignac number, because 323220161 - 2²² = 319025857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (323220661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1335500 + ... + 1335741.

It is an arithmetic number, because the mean of its divisors is an integer number (59212531).

Almost surely, 2^323220161 is an apocalyptic number.

It is an amenable number.

323220161 is a deficient number, since it is larger than the sum of its proper divisors (32055025).

323220161 is a wasteful number, since it uses less digits than its factorization.

323220161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671263 (or 2671252 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 323220161 is about 17978.3247551044. The cubic root of 323220161 is about 686.2770578900.

Adding to 323220161 its reverse (161022323), we get a palindrome (484242484).

The spelling of 323220161 in words is "three hundred twenty-three million, two hundred twenty thousand, one hundred sixty-one".