65219321 has 2 divisors, whose sum is σ = 65219322. Its totient is φ = 65219320.

The previous prime is 65219317. The next prime is 65219339. The reversal of 65219321 is 12391256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48930025 + 16289296 = 6995^2 + 4036^2 .

It is a cyclic number.

It is not a de Polignac number, because 65219321 - 2² = 65219317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65219311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32609660 + 32609661.

It is an arithmetic number, because the mean of its divisors is an integer number (32609661).

Almost surely, 2^65219321 is an apocalyptic number.

It is an amenable number.

65219321 is a deficient number, since it is larger than the sum of its proper divisors (1).

65219321 is an equidigital number, since it uses as much as digits as its factorization.

65219321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 65219321 is about 8075.8480050085. The cubic root of 65219321 is about 402.5242884923.

The spelling of 65219321 in words is "sixty-five million, two hundred nineteen thousand, three hundred twenty-one".