19536561 has 12 divisors (see below), whose sum is σ = 30785040. Its totient is φ = 11840280.

The previous prime is 19536557. The next prime is 19536571. The reversal of 19536561 is 16563591.

19536561 is a `hidden beast` number, since 1 + 95 + 3 + 6 + 561 = 666.

It is not a de Polignac number, because 19536561 - 2² = 19536557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19536551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98571 + ... + 98768.

It is an arithmetic number, because the mean of its divisors is an integer number (2565420).

Almost surely, 2^19536561 is an apocalyptic number.

19536561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19536561 is a deficient number, since it is larger than the sum of its proper divisors (11248479).

19536561 is a wasteful number, since it uses less digits than its factorization.

19536561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197356 (or 197353 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 19536561 is about 4420.0182126322. The cubic root of 19536561 is about 269.3287440741.

The spelling of 19536561 in words is "nineteen million, five hundred thirty-six thousand, five hundred sixty-one".