1643139353 has 2 divisors, whose sum is σ = 1643139354. Its totient is φ = 1643139352.

The previous prime is 1643139331. The next prime is 1643139359. The reversal of 1643139353 is 3539313461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879003904 + 764135449 = 29648^2 + 27643^2 .

It is an emirp because it is prime and its reverse (3539313461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1643139353 - 2¹⁴ = 1643122969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643139359) 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, 821569676 + 821569677.

It is an arithmetic number, because the mean of its divisors is an integer number (821569677).

Almost surely, 2^1643139353 is an apocalyptic number.

It is an amenable number.

1643139353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643139353 is an equidigital number, since it uses as much as digits as its factorization.

1643139353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 38.

The square root of 1643139353 is about 40535.6553295984. The cubic root of 1643139353 is about 1180.0256991913.

The spelling of 1643139353 in words is "one billion, six hundred forty-three million, one hundred thirty-nine thousand, three hundred fifty-three".