181131828 has 12 divisors (see below), whose sum is σ = 422640960. Its totient is φ = 60377272.

The previous prime is 181131817. The next prime is 181131871. The reversal of 181131828 is 828131181.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×181131828² = 65617478229243168, which 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 3 ways as a sum of consecutive naturals, for example, 7547148 + ... + 7547171.

It is an arithmetic number, because the mean of its divisors is an integer number (35220080).

Almost surely, 2^181131828 is an apocalyptic number.

It is an amenable number.

181131828 is an abundant number, since it is smaller than the sum of its proper divisors (241509132).

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

181131828 is a wasteful number, since it uses less digits than its factorization.

181131828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15094326 (or 15094324 counting only the distinct ones).

The product of its digits is 3072, while the sum is 33.

The square root of 181131828 is about 13458.5225043465. The cubic root of 181131828 is about 565.8025798681.

The spelling of 181131828 in words is "one hundred eighty-one million, one hundred thirty-one thousand, eight hundred twenty-eight".