161540272 has 20 divisors (see below), whose sum is σ = 313627000. Its totient is φ = 80604288.

The previous prime is 161540263. The next prime is 161540279. The reversal of 161540272 is 272045161.

It is a self number, because there is not a number n which added to its sum of digits gives 161540272.

It is not an unprimeable number, because it can be changed into a prime (161540279) 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, 2133 + ... + 18100.

It is an arithmetic number, because the mean of its divisors is an integer number (15681350).

Almost surely, 2^161540272 is an apocalyptic number.

It is an amenable number.

161540272 is a deficient number, since it is larger than the sum of its proper divisors (152086728).

161540272 is a wasteful number, since it uses less digits than its factorization.

161540272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20740 (or 20734 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 161540272 is about 12709.8494090213. The cubic root of 161540272 is about 544.6200218703.

The spelling of 161540272 in words is "one hundred sixty-one million, five hundred forty thousand, two hundred seventy-two".