1321438817 has 2 divisors, whose sum is σ = 1321438818. Its totient is φ = 1321438816.

The previous prime is 1321438813. The next prime is 1321438861. The reversal of 1321438817 is 7188341231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878588881 + 442849936 = 29641^2 + 21044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321438817 - 2² = 1321438813 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321438813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660719408 + 660719409.

It is an arithmetic number, because the mean of its divisors is an integer number (660719409).

Almost surely, 2^1321438817 is an apocalyptic number.

It is an amenable number.

1321438817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321438817 is an equidigital number, since it uses as much as digits as its factorization.

1321438817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 1321438817 is about 36351.5999235247. The cubic root of 1321438817 is about 1097.3597330783.

The spelling of 1321438817 in words is "one billion, three hundred twenty-one million, four hundred thirty-eight thousand, eight hundred seventeen".