181834381 has 4 divisors (see below), whose sum is σ = 182088000. Its totient is φ = 181580764.

The previous prime is 181834369. The next prime is 181834421. The reversal of 181834381 is 183438181.

181834381 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 181834381 - 2⁷ = 181834253 is a prime.

It is a super-2 number, since 2×181834381² = 66127484227306322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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 181834381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181894381) 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, 125731 + ... + 127168.

It is an arithmetic number, because the mean of its divisors is an integer number (45522000).

Almost surely, 2^181834381 is an apocalyptic number.

It is an amenable number.

181834381 is a deficient number, since it is larger than the sum of its proper divisors (253619).

181834381 is an equidigital number, since it uses as much as digits as its factorization.

181834381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253618.

The product of its digits is 18432, while the sum is 37.

The square root of 181834381 is about 13484.5979176244. The cubic root of 181834381 is about 566.5331591284.

The spelling of 181834381 in words is "one hundred eighty-one million, eight hundred thirty-four thousand, three hundred eighty-one".