56018561 has 2 divisors, whose sum is σ = 56018562. Its totient is φ = 56018560.

The previous prime is 56018533. The next prime is 56018569. The reversal of 56018561 is 16581065.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45495025 + 10523536 = 6745^2 + 3244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56018561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56018569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28009280 + 28009281.

It is an arithmetic number, because the mean of its divisors is an integer number (28009281).

Almost surely, 2^56018561 is an apocalyptic number.

It is an amenable number.

56018561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56018561 is an equidigital number, since it uses as much as digits as its factorization.

56018561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 56018561 is about 7484.5548297811. The cubic root of 56018561 is about 382.6285008326.

The spelling of 56018561 in words is "fifty-six million, eighteen thousand, five hundred sixty-one".