1630346321 has 2 divisors, whose sum is σ = 1630346322. Its totient is φ = 1630346320.

The previous prime is 1630346297. The next prime is 1630346339. The reversal of 1630346321 is 1236430361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1485023296 + 145323025 = 38536^2 + 12055^2 .

It is an emirp because it is prime and its reverse (1236430361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630346321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1630346381) 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, 815173160 + 815173161.

It is an arithmetic number, because the mean of its divisors is an integer number (815173161).

Almost surely, 2^1630346321 is an apocalyptic number.

It is an amenable number.

1630346321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630346321 is an equidigital number, since it uses as much as digits as its factorization.

1630346321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 1630346321 is about 40377.5472385334. The cubic root of 1630346321 is about 1176.9552647623.

Adding to 1630346321 its reverse (1236430361), we get a palindrome (2866776682).

The spelling of 1630346321 in words is "one billion, six hundred thirty million, three hundred forty-six thousand, three hundred twenty-one".