18452561 has 8 divisors (see below), whose sum is σ = 18928104. Its totient is φ = 17982720.

The previous prime is 18452549. The next prime is 18452569. The reversal of 18452561 is 16525481.

It can be written as a sum of positive squares in 4 ways, for example, as 5202961 + 13249600 = 2281^2 + 3640^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18452561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18452569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5555 + ... + 8231.

It is an arithmetic number, because the mean of its divisors is an integer number (2366013).

Almost surely, 2^18452561 is an apocalyptic number.

It is an amenable number.

18452561 is a deficient number, since it is larger than the sum of its proper divisors (475543).

18452561 is a wasteful number, since it uses less digits than its factorization.

18452561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851.

The product of its digits is 9600, while the sum is 32.

The square root of 18452561 is about 4295.6444219698. The cubic root of 18452561 is about 264.2523652379.

It can be divided in two parts, 184525 and 61, that multiplied together give a square (11256025 = 3355²).

The spelling of 18452561 in words is "eighteen million, four hundred fifty-two thousand, five hundred sixty-one".