161321432 has 32 divisors (see below), whose sum is σ = 331322400. Its totient is φ = 73296384.

The previous prime is 161321401. The next prime is 161321441. The reversal of 161321432 is 234123161.

161321432 is digitally balanced in base 2, 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 = 161321398 and 161321407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16508 + ... + 24395.

It is an arithmetic number, because the mean of its divisors is an integer number (10353825).

Almost surely, 2^161321432 is an apocalyptic number.

It is an amenable number.

161321432 is an abundant number, since it is smaller than the sum of its proper divisors (170000968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161321432 is a wasteful number, since it uses less digits than its factorization.

161321432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40955 (or 40951 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 161321432 is about 12701.2374200312. The cubic root of 161321432 is about 544.3739769165.

Adding to 161321432 its reverse (234123161), we get a palindrome (395444593).

The spelling of 161321432 in words is "one hundred sixty-one million, three hundred twenty-one thousand, four hundred thirty-two".