181232081 has 4 divisors (see below), whose sum is σ = 182615664. Its totient is φ = 179848500.

The previous prime is 181232059. The next prime is 181232113. The reversal of 181232081 is 180232181.

181232081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 181232081 - 2⁶ = 181232017 is a prime.

It is a super-2 number, since 2×181232081² = 65690134367181122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181232081.

It is not an unprimeable number, because it can be changed into a prime (181232021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691595 + ... + 691856.

It is an arithmetic number, because the mean of its divisors is an integer number (45653916).

Almost surely, 2^181232081 is an apocalyptic number.

It is an amenable number.

181232081 is a deficient number, since it is larger than the sum of its proper divisors (1383583).

181232081 is a wasteful number, since it uses less digits than its factorization.

181232081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383582.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 181232081 is about 13462.2465064342. The cubic root of 181232081 is about 565.9069475815.

The spelling of 181232081 in words is "one hundred eighty-one million, two hundred thirty-two thousand, eighty-one".