161919532 has 12 divisors (see below), whose sum is σ = 283496976. Its totient is φ = 80920400.

The previous prime is 161919497. The next prime is 161919533. The reversal of 161919532 is 235919161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161919491 and 161919500.

It is not an unprimeable number, because it can be changed into a prime (161919533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657 + ... + 18007.

It is an arithmetic number, because the mean of its divisors is an integer number (23624748).

Almost surely, 2^161919532 is an apocalyptic number.

It is an amenable number.

161919532 is a deficient number, since it is larger than the sum of its proper divisors (121577444).

161919532 is a wasteful number, since it uses less digits than its factorization.

161919532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19688 (or 19686 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The square root of 161919532 is about 12724.7605871388. The cubic root of 161919532 is about 545.0459036049.

The spelling of 161919532 in words is "one hundred sixty-one million, nine hundred nineteen thousand, five hundred thirty-two".