181995012 has 30 divisors (see below), whose sum is σ = 475771758. Its totient is φ = 60664896.

The previous prime is 181994993. The next prime is 181995019. The reversal of 181995012 is 210599181.

It can be written as a sum of positive squares in only one way, i.e., 181279296 + 715716 = 13464^2 + 846^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (181995019) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 280533 + ... + 281180.

Almost surely, 2^181995012 is an apocalyptic number.

181995012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181995012 is an abundant number, since it is smaller than the sum of its proper divisors (293776746).

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

181995012 is a wasteful number, since it uses less digits than its factorization.

181995012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561729 (or 561718 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 181995012 is about 13490.5526943858. The cubic root of 181995012 is about 566.6999336102.

The spelling of 181995012 in words is "one hundred eighty-one million, nine hundred ninety-five thousand, twelve".