68453521 has 2 divisors, whose sum is σ = 68453522. Its totient is φ = 68453520.

The previous prime is 68453513. The next prime is 68453527. The reversal of 68453521 is 12535486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56791296 + 11662225 = 7536^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 68453521 - 2³ = 68453513 is a prime.

It is not a weakly prime, because it can be changed into another prime (68453527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34226760 + 34226761.

It is an arithmetic number, because the mean of its divisors is an integer number (34226761).

Almost surely, 2^68453521 is an apocalyptic number.

It is an amenable number.

68453521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68453521 is an equidigital number, since it uses as much as digits as its factorization.

68453521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 68453521 is about 8273.6643030764. The cubic root of 68453521 is about 409.0709102846.

The spelling of 68453521 in words is "sixty-eight million, four hundred fifty-three thousand, five hundred twenty-one".