161983172 has 12 divisors (see below), whose sum is σ = 305276076. Its totient is φ = 74761440.

The previous prime is 161983147. The next prime is 161983177. The reversal of 161983172 is 271389161.

161983172 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15476356 + 146506816 = 3934^2 + 12104^2 .

It is a super-3 number, since 3×161983172³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (161983177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557479 + ... + 1557582.

It is an arithmetic number, because the mean of its divisors is an integer number (25439673).

Almost surely, 2^161983172 is an apocalyptic number.

It is an amenable number.

161983172 is a deficient number, since it is larger than the sum of its proper divisors (143292904).

161983172 is a wasteful number, since it uses less digits than its factorization.

161983172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115078 (or 3115076 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 161983172 is about 12727.2609779167. The cubic root of 161983172 is about 545.1173015754.

The spelling of 161983172 in words is "one hundred sixty-one million, nine hundred eighty-three thousand, one hundred seventy-two".