18528561 has 16 divisors (see below), whose sum is σ = 27652800. Its totient is φ = 12261024.

The previous prime is 18528557. The next prime is 18528577. The reversal of 18528561 is 16582581.

It is not a de Polignac number, because 18528561 - 2² = 18528557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18548561) 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, 1285 + ... + 6221.

It is an arithmetic number, because the mean of its divisors is an integer number (1728300).

Almost surely, 2^18528561 is an apocalyptic number.

It is an amenable number.

18528561 is a deficient number, since it is larger than the sum of its proper divisors (9124239).

18528561 is a wasteful number, since it uses less digits than its factorization.

18528561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085 (or 5079 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 18528561 is about 4304.4815018769. The cubic root of 18528561 is about 264.6146576894.

The spelling of 18528561 in words is "eighteen million, five hundred twenty-eight thousand, five hundred sixty-one".