161021232 has 30 divisors (see below), whose sum is σ = 450636212. Its totient is φ = 53673696.

The previous prime is 161021221. The next prime is 161021323. The reversal of 161021232 is 232120161.

161021232 is a `hidden beast` number, since 1 + 610 + 21 + 2 + 32 = 666.

161021232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 558958 + ... + 559245.

Almost surely, 2^161021232 is an apocalyptic number.

161021232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161021232 is an abundant number, since it is smaller than the sum of its proper divisors (289614980).

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

161021232 is a wasteful number, since it uses less digits than its factorization.

161021232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118217 (or 1118208 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 161021232 is about 12689.4141708749. The cubic root of 161021232 is about 544.0360955000.

Adding to 161021232 its reverse (232120161), we get a palindrome (393141393).

The spelling of 161021232 in words is "one hundred sixty-one million, twenty-one thousand, two hundred thirty-two".