161333272 has 16 divisors (see below), whose sum is σ = 308208240. Its totient is φ = 79144416.

The previous prime is 161333261. The next prime is 161333273. The reversal of 161333272 is 272333161.

161333272 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161333272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161333273) 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 3 ways as a sum of consecutive naturals, for example, 189828 + ... + 190675.

It is an arithmetic number, because the mean of its divisors is an integer number (19263015).

Almost surely, 2^161333272 is an apocalyptic number.

It is an amenable number.

161333272 is a deficient number, since it is larger than the sum of its proper divisors (146874968).

161333272 is a wasteful number, since it uses less digits than its factorization.

161333272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380562 (or 380558 counting only the distinct ones).

The product of its digits is 4536, while the sum is 28.

The square root of 161333272 is about 12701.7035077977. The cubic root of 161333272 is about 544.3872944902.

The spelling of 161333272 in words is "one hundred sixty-one million, three hundred thirty-three thousand, two hundred seventy-two".