161880143 has 6 divisors (see below), whose sum is σ = 166374936. Its totient is φ = 157503672.

The previous prime is 161880139. The next prime is 161880163. The reversal of 161880143 is 341088161.

It is a happy number.

It is not a de Polignac number, because 161880143 - 2² = 161880139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161880113) 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 5 ways as a sum of consecutive naturals, for example, 57755 + ... + 60492.

It is an arithmetic number, because the mean of its divisors is an integer number (27729156).

Almost surely, 2^161880143 is an apocalyptic number.

161880143 is a deficient number, since it is larger than the sum of its proper divisors (4494793).

161880143 is an equidigital number, since it uses as much as digits as its factorization.

161880143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118321 (or 118284 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 161880143 is about 12723.2127625062. The cubic root of 161880143 is about 545.0017035550.

The spelling of 161880143 in words is "one hundred sixty-one million, eight hundred eighty thousand, one hundred forty-three".