65739521 has 2 divisors, whose sum is σ = 65739522. Its totient is φ = 65739520.

The previous prime is 65739463. The next prime is 65739551. The reversal of 65739521 is 12593756.

It is a happy number.

65739521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 17977600 = 6911^2 + 4240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65739521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65739551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32869760 + 32869761.

It is an arithmetic number, because the mean of its divisors is an integer number (32869761).

Almost surely, 2^65739521 is an apocalyptic number.

It is an amenable number.

65739521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65739521 is an equidigital number, since it uses as much as digits as its factorization.

65739521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 38.

The square root of 65739521 is about 8107.9911815443. The cubic root of 65739521 is about 403.5916555831.

The spelling of 65739521 in words is "sixty-five million, seven hundred thirty-nine thousand, five hundred twenty-one".