181560564 has 18 divisors (see below), whose sum is σ = 458944850. Its totient is φ = 60520176.

The previous prime is 181560541. The next prime is 181560571. The reversal of 181560564 is 465065181.

181560564 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 98604900 + 82955664 = 9930^2 + 9108^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5043349 = 181560564 / (1 + 8 + 1 + 5 + 6 + 0 + 5 + 6 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2521639 + ... + 2521710.

Almost surely, 2^181560564 is an apocalyptic number.

It is an amenable number.

181560564 is an abundant number, since it is smaller than the sum of its proper divisors (277384286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181560564 is a wasteful number, since it uses less digits than its factorization.

181560564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043359 (or 5043354 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 181560564 is about 13474.4411386892. The cubic root of 181560564 is about 566.2486431849.

The spelling of 181560564 in words is "one hundred eighty-one million, five hundred sixty thousand, five hundred sixty-four".