181745089 has 12 divisors (see below), whose sum is σ = 192702180. Its totient is φ = 171383040.

The previous prime is 181745063. The next prime is 181745093. The reversal of 181745089 is 980547181.

It is a happy number.

181745089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149255089 + 32490000 = 12217^2 + 5700^2 .

It is a de Polignac number, because none of the positive numbers 2^k-181745089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181745029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85957 + ... + 88045.

It is an arithmetic number, because the mean of its divisors is an integer number (16058515).

Almost surely, 2^181745089 is an apocalyptic number.

181745089 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

181745089 is a deficient number, since it is larger than the sum of its proper divisors (10957091).

181745089 is a wasteful number, since it uses less digits than its factorization.

181745089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 181745089 is about 13481.2866225743. The cubic root of 181745089 is about 566.4404095958.

The spelling of 181745089 in words is "one hundred eighty-one million, seven hundred forty-five thousand, eighty-nine".