161281118 has 16 divisors (see below), whose sum is σ = 245379456. Its totient is φ = 79492440.

The previous prime is 161281117. The next prime is 161281147. The reversal of 161281118 is 811182161.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161281117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105983 + ... + 107493.

It is an arithmetic number, because the mean of its divisors is an integer number (15336216).

Almost surely, 2^161281118 is an apocalyptic number.

161281118 is a deficient number, since it is larger than the sum of its proper divisors (84098338).

161281118 is a wasteful number, since it uses less digits than its factorization.

161281118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its digits is 768, while the sum is 29.

The square root of 161281118 is about 12699.6503101463. The cubic root of 161281118 is about 544.3286270404.

The spelling of 161281118 in words is "one hundred sixty-one million, two hundred eighty-one thousand, one hundred eighteen".