56080721 has 2 divisors, whose sum is σ = 56080722. Its totient is φ = 56080720.

The previous prime is 56080711. The next prime is 56080727. The reversal of 56080721 is 12708065.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 130321 = 7480^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 56080721 - 2¹⁸ = 55818577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56080727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28040360 + 28040361.

It is an arithmetic number, because the mean of its divisors is an integer number (28040361).

Almost surely, 2^56080721 is an apocalyptic number.

It is an amenable number.

56080721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56080721 is an equidigital number, since it uses as much as digits as its factorization.

56080721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 56080721 is about 7488.7062300507. The cubic root of 56080721 is about 382.7699741549.

Adding to 56080721 its reverse (12708065), we get a palindrome (68788786).

The spelling of 56080721 in words is "fifty-six million, eighty thousand, seven hundred twenty-one".