181020043 has 4 divisors (see below), whose sum is σ = 185435208. Its totient is φ = 176604880.

The previous prime is 181020041. The next prime is 181020079. The reversal of 181020043 is 340020181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340020181 = 19 ⋅17895799.

It is a cyclic number.

It is not a de Polignac number, because 181020043 - 2¹ = 181020041 is a prime.

It is a super-3 number, since 3×181020043³ (a number of 26 digits) contains 333 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 181020043.

It is not an unprimeable number, because it can be changed into a prime (181020041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207521 + ... + 2207602.

It is an arithmetic number, because the mean of its divisors is an integer number (46358802).

Almost surely, 2^181020043 is an apocalyptic number.

181020043 is a deficient number, since it is larger than the sum of its proper divisors (4415165).

181020043 is an equidigital number, since it uses as much as digits as its factorization.

181020043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415164.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 181020043 is about 13454.3689186821. The cubic root of 181020043 is about 565.6861614235.

The spelling of 181020043 in words is "one hundred eighty-one million, twenty thousand, forty-three".