161021932 has 12 divisors (see below), whose sum is σ = 281904840. Its totient is φ = 80477696.

The previous prime is 161021881. The next prime is 161021933. The reversal of 161021932 is 239120161.

It is a junction number, because it is equal to n+sod(n) for n = 161021897 and 161021906.

It is not an unprimeable number, because it can be changed into a prime (161021933) 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, 4908 + ... + 18604.

It is an arithmetic number, because the mean of its divisors is an integer number (23492070).

Almost surely, 2^161021932 is an apocalyptic number.

It is an amenable number.

161021932 is a deficient number, since it is larger than the sum of its proper divisors (120882908).

161021932 is a wasteful number, since it uses less digits than its factorization.

161021932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640 (or 16638 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 161021932 is about 12689.4417528905. The cubic root of 161021932 is about 544.0368838530.

The spelling of 161021932 in words is "one hundred sixty-one million, twenty-one thousand, nine hundred thirty-two".