181681445 has 16 divisors (see below), whose sum is σ = 238920192. Its totient is φ = 131530560.

The previous prime is 181681441. The next prime is 181681447. The reversal of 181681445 is 544186181.

181681445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181681445 - 2² = 181681441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181681399 and 181681408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181681441) 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, 4859 + ... + 19671.

It is an arithmetic number, because the mean of its divisors is an integer number (14932512).

Almost surely, 2^181681445 is an apocalyptic number.

It is an amenable number.

181681445 is a deficient number, since it is larger than the sum of its proper divisors (57238747).

181681445 is a wasteful number, since it uses less digits than its factorization.

181681445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15052.

The product of its digits is 30720, while the sum is 38.

The square root of 181681445 is about 13478.9259586957. The cubic root of 181681445 is about 566.3742826512.

The spelling of 181681445 in words is "one hundred eighty-one million, six hundred eighty-one thousand, four hundred forty-five".