161223436 has 48 divisors (see below), whose sum is σ = 334494720. Its totient is φ = 67176000.

The previous prime is 161223431. The next prime is 161223443. The reversal of 161223436 is 634322161.

It is not an unprimeable number, because it can be changed into a prime (161223431) 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 in 15 ways as a sum of consecutive naturals, for example, 22806 + ... + 29026.

It is an arithmetic number, because the mean of its divisors is an integer number (6968640).

Almost surely, 2^161223436 is an apocalyptic number.

It is an amenable number.

161223436 is an abundant number, since it is smaller than the sum of its proper divisors (173271284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161223436 is a wasteful number, since it uses less digits than its factorization.

161223436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6286 (or 6284 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 161223436 is about 12697.3790996410. The cubic root of 161223436 is about 544.2637264739.

Adding to 161223436 its reverse (634322161), we get a palindrome (795545597).

The spelling of 161223436 in words is "one hundred sixty-one million, two hundred twenty-three thousand, four hundred thirty-six".