56523661 has 2 divisors, whose sum is σ = 56523662. Its totient is φ = 56523660.

The previous prime is 56523653. The next prime is 56523683. The reversal of 56523661 is 16632565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56025225 + 498436 = 7485^2 + 706^2 .

It is a cyclic number.

It is not a de Polignac number, because 56523661 - 2³ = 56523653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56523641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28261830 + 28261831.

It is an arithmetic number, because the mean of its divisors is an integer number (28261831).

Almost surely, 2^56523661 is an apocalyptic number.

It is an amenable number.

56523661 is a deficient number, since it is larger than the sum of its proper divisors (1).

56523661 is an equidigital number, since it uses as much as digits as its factorization.

56523661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 56523661 is about 7518.2219307493. The cubic root of 56523661 is about 383.7750712717.

The spelling of 56523661 in words is "fifty-six million, five hundred twenty-three thousand, six hundred sixty-one".