161231632 has 20 divisors (see below), whose sum is σ = 312926400. Its totient is φ = 80476448.

The previous prime is 161231611. The next prime is 161231659. The reversal of 161231632 is 236132161.

161231632 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161231597 and 161231606.

It is an unprimeable number.

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, 1173 + ... + 17995.

It is an arithmetic number, because the mean of its divisors is an integer number (15646320).

Almost surely, 2^161231632 is an apocalyptic number.

It is an amenable number.

161231632 is a deficient number, since it is larger than the sum of its proper divisors (151694768).

161231632 is a wasteful number, since it uses less digits than its factorization.

161231632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17430 (or 17424 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 161231632 is about 12697.7018393093. The cubic root of 161231632 is about 544.2729490990.

Adding to 161231632 its reverse (236132161), we get a palindrome (397363793).

The spelling of 161231632 in words is "one hundred sixty-one million, two hundred thirty-one thousand, six hundred thirty-two".