181231152 has 80 divisors (see below), whose sum is σ = 507904992. Its totient is φ = 55459840.

The previous prime is 181231151. The next prime is 181231153. The reversal of 181231152 is 251132181.

181231152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (181231151) and next prime (181231153).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (181231151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30748 + ... + 36164.

Almost surely, 2^181231152 is an apocalyptic number.

181231152 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 181231152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253952496).

181231152 is an abundant number, since it is smaller than the sum of its proper divisors (326673840).

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

181231152 is a wasteful number, since it uses less digits than its factorization.

181231152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5486 (or 5480 counting only the distinct ones).

The product of its digits is 480, while the sum is 24.

The square root of 181231152 is about 13462.2120024905. The cubic root of 181231152 is about 565.9059806290.

The spelling of 181231152 in words is "one hundred eighty-one million, two hundred thirty-one thousand, one hundred fifty-two".