56523721 has 2 divisors, whose sum is σ = 56523722. Its totient is φ = 56523720.

The previous prime is 56523683. The next prime is 56523767. The reversal of 56523721 is 12732565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54228496 + 2295225 = 7364^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 56523721 - 2⁹ = 56523209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56523781) 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, 28261860 + 28261861.

It is an arithmetic number, because the mean of its divisors is an integer number (28261861).

Almost surely, 2^56523721 is an apocalyptic number.

It is an amenable number.

56523721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56523721 is an equidigital number, since it uses as much as digits as its factorization.

56523721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 56523721 is about 7518.2259210535. The cubic root of 56523721 is about 383.7752070644.

The spelling of 56523721 in words is "fifty-six million, five hundred twenty-three thousand, seven hundred twenty-one".