161332140 has 24 divisors (see below), whose sum is σ = 451730160. Its totient is φ = 43021888.

The previous prime is 161332123. The next prime is 161332201. The reversal of 161332140 is 41233161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344375 + ... + 1344494.

It is an arithmetic number, because the mean of its divisors is an integer number (18822090).

Almost surely, 2^161332140 is an apocalyptic number.

161332140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161332140 is an abundant number, since it is smaller than the sum of its proper divisors (290398020).

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

161332140 is a wasteful number, since it uses less digits than its factorization.

161332140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688881 (or 2688879 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 161332140 is about 12701.6589467675. The cubic root of 161332140 is about 544.3860212504.

The spelling of 161332140 in words is "one hundred sixty-one million, three hundred thirty-two thousand, one hundred forty".