181920110100 has 72 divisors (see below), whose sum is σ = 528255960288. Its totient is φ = 48336873600.

The previous prime is 181920110093. The next prime is 181920110111. The reversal of 181920110100 is 1011029181.

It is a super-2 number, since 2×181920110100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1011486 + ... + 1177685.

Almost surely, 2^181920110100 is an apocalyptic number.

181920110100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181920110100 is an abundant number, since it is smaller than the sum of its proper divisors (346335850188).

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

181920110100 is a wasteful number, since it uses less digits than its factorization.

181920110100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189465 (or 2189458 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 24.

Adding to 181920110100 its reverse (1011029181), we get a palindrome (182931139281).

The spelling of 181920110100 in words is "one hundred eighty-one billion, nine hundred twenty million, one hundred ten thousand, one hundred".