181361616 has 40 divisors (see below), whose sum is σ = 479418720. Its totient is φ = 59047296.

The previous prime is 181361603. The next prime is 181361623. The reversal of 181361616 is 616163181.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41871 + ... + 45998.

It is an arithmetic number, because the mean of its divisors is an integer number (11985468).

Almost surely, 2^181361616 is an apocalyptic number.

181361616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181361616 is an abundant number, since it is smaller than the sum of its proper divisors (298057104).

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

181361616 is a wasteful number, since it uses less digits than its factorization.

181361616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87923 (or 87917 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 181361616 is about 13467.0566940219. The cubic root of 181361616 is about 566.0417421466.

The spelling of 181361616 in words is "one hundred eighty-one million, three hundred sixty-one thousand, six hundred sixteen".