181158012 has 96 divisors (see below), whose sum is σ = 555340800. Its totient is φ = 49968576.

The previous prime is 181157993. The next prime is 181158023. The reversal of 181158012 is 210851181.

181158012 is a `hidden beast` number, since 1 + 81 + 1 + 580 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17793 + ... + 26055.

It is an arithmetic number, because the mean of its divisors is an integer number (5784800).

Almost surely, 2^181158012 is an apocalyptic number.

181158012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181158012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277670400).

181158012 is an abundant number, since it is smaller than the sum of its proper divisors (374182788).

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

181158012 is a wasteful number, since it uses less digits than its factorization.

181158012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8312 (or 8304 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 181158012 is about 13459.4952357063. The cubic root of 181158012 is about 565.8298422605.

The spelling of 181158012 in words is "one hundred eighty-one million, one hundred fifty-eight thousand, twelve".