161320232 has 16 divisors (see below), whose sum is σ = 304149300. Its totient is φ = 80213760.

The previous prime is 161320231. The next prime is 161320253. The reversal of 161320232 is 232023161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 139098436 + 22221796 = 11794^2 + 4714^2 .

It is not an unprimeable number, because it can be changed into a prime (161320231) 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 3 ways as a sum of consecutive naturals, for example, 54257 + ... + 57152.

Almost surely, 2^161320232 is an apocalyptic number.

It is an amenable number.

161320232 is a deficient number, since it is larger than the sum of its proper divisors (142829068).

161320232 is a wasteful number, since it uses less digits than its factorization.

161320232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111596 (or 111592 counting only the distinct ones).

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

The square root of 161320232 is about 12701.1901804516. The cubic root of 161320232 is about 544.3726271260.

Adding to 161320232 its reverse (232023161), we get a palindrome (393343393).

The spelling of 161320232 in words is "one hundred sixty-one million, three hundred twenty thousand, two hundred thirty-two".