181346645 has 4 divisors (see below), whose sum is σ = 217615980. Its totient is φ = 145077312.

The previous prime is 181346639. The next prime is 181346647. The reversal of 181346645 is 546643181.

181346645 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.

It can be written as a sum of positive squares in 2 ways, for example, as 45064369 + 136282276 = 6713^2 + 11674^2 .

It is a cyclic number.

It is not a de Polignac number, because 181346645 - 2⁴ = 181346629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181346599 and 181346608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181346647) 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, 18134660 + ... + 18134669.

It is an arithmetic number, because the mean of its divisors is an integer number (54403995).

Almost surely, 2^181346645 is an apocalyptic number.

It is an amenable number.

181346645 is a deficient number, since it is larger than the sum of its proper divisors (36269335).

181346645 is an equidigital number, since it uses as much as digits as its factorization.

181346645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36269334.

The product of its digits is 69120, while the sum is 38.

The square root of 181346645 is about 13466.5008446886. The cubic root of 181346645 is about 566.0261665536.

The spelling of 181346645 in words is "one hundred eighty-one million, three hundred forty-six thousand, six hundred forty-five".