1321851803 has 2 divisors, whose sum is σ = 1321851804. Its totient is φ = 1321851802.

The previous prime is 1321851757. The next prime is 1321851841. The reversal of 1321851803 is 3081581231.

It is a strong prime.

It is an emirp because it is prime and its reverse (3081581231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321851803 - 2¹⁴ = 1321835419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321851803.

It is not a weakly prime, because it can be changed into another prime (1321851893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660925901 + 660925902.

It is an arithmetic number, because the mean of its divisors is an integer number (660925902).

Almost surely, 2^1321851803 is an apocalyptic number.

1321851803 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321851803 is an equidigital number, since it uses as much as digits as its factorization.

1321851803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1321851803 is about 36357.2799175076. The cubic root of 1321851803 is about 1097.4740395442.

The spelling of 1321851803 in words is "one billion, three hundred twenty-one million, eight hundred fifty-one thousand, eight hundred three".