161533323 has 24 divisors (see below), whose sum is σ = 267352800. Its totient is φ = 92064384.

The previous prime is 161533321. The next prime is 161533331. The reversal of 161533323 is 323335161.

It is a happy number.

It is not a de Polignac number, because 161533323 - 2¹ = 161533321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161533321) 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 23 ways as a sum of consecutive naturals, for example, 22633 + ... + 28901.

It is an arithmetic number, because the mean of its divisors is an integer number (11139700).

Almost surely, 2^161533323 is an apocalyptic number.

161533323 is a deficient number, since it is larger than the sum of its proper divisors (105819477).

161533323 is a wasteful number, since it uses less digits than its factorization.

161533323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6691 (or 6688 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

The square root of 161533323 is about 12709.5760354152. The cubic root of 161533323 is about 544.6122124269.

Adding to 161533323 its reverse (323335161), we get a palindrome (484868484).

The spelling of 161533323 in words is "one hundred sixty-one million, five hundred thirty-three thousand, three hundred twenty-three".