161985126 has 32 divisors (see below), whose sum is σ = 335916000. Its totient is φ = 52012800.

The previous prime is 161985121. The next prime is 161985143. The reversal of 161985126 is 621589161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161985121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103800 + ... + 105348.

It is an arithmetic number, because the mean of its divisors is an integer number (10497375).

Almost surely, 2^161985126 is an apocalyptic number.

161985126 is an abundant number, since it is smaller than the sum of its proper divisors (173930874).

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

161985126 is a wasteful number, since it uses less digits than its factorization.

161985126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184.

The product of its digits is 25920, while the sum is 39.

The square root of 161985126 is about 12727.3377420417. The cubic root of 161985126 is about 545.1194934799.

The spelling of 161985126 in words is "one hundred sixty-one million, nine hundred eighty-five thousand, one hundred twenty-six".