60556721 has 2 divisors, whose sum is σ = 60556722. Its totient is φ = 60556720.

The previous prime is 60556711. The next prime is 60556759. The reversal of 60556721 is 12765506.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 21669025 = 6236^2 + 4655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-60556721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (60556711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30278360 + 30278361.

It is an arithmetic number, because the mean of its divisors is an integer number (30278361).

Almost surely, 2^60556721 is an apocalyptic number.

It is an amenable number.

60556721 is a deficient number, since it is larger than the sum of its proper divisors (1).

60556721 is an equidigital number, since it uses as much as digits as its factorization.

60556721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 60556721 is about 7781.8199028248. The cubic root of 60556721 is about 392.6938655799.

The spelling of 60556721 in words is "sixty million, five hundred fifty-six thousand, seven hundred twenty-one".