1378364321 has 2 divisors, whose sum is σ = 1378364322. Its totient is φ = 1378364320.

The previous prime is 1378364303. The next prime is 1378364333. The reversal of 1378364321 is 1234638731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1358659600 + 19704721 = 36860^2 + 4439^2 .

It is an emirp because it is prime and its reverse (1234638731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378364321 - 2⁶ = 1378364257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378364341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689182160 + 689182161.

It is an arithmetic number, because the mean of its divisors is an integer number (689182161).

Almost surely, 2^1378364321 is an apocalyptic number.

It is an amenable number.

1378364321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378364321 is an equidigital number, since it uses as much as digits as its factorization.

1378364321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 1378364321 is about 37126.3292152618. The cubic root of 1378364321 is about 1112.8962378650.

The spelling of 1378364321 in words is "one billion, three hundred seventy-eight million, three hundred sixty-four thousand, three hundred twenty-one".