1378321057 has 2 divisors, whose sum is σ = 1378321058. Its totient is φ = 1378321056.

The previous prime is 1378321051. The next prime is 1378321093. The reversal of 1378321057 is 7501238731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163082816 + 215238241 = 34104^2 + 14671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378321057 - 2¹¹ = 1378319009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378321051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689160528 + 689160529.

It is an arithmetic number, because the mean of its divisors is an integer number (689160529).

Almost surely, 2^1378321057 is an apocalyptic number.

It is an amenable number.

1378321057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378321057 is an equidigital number, since it uses as much as digits as its factorization.

1378321057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 1378321057 is about 37125.7465514163. The cubic root of 1378321057 is about 1112.8845939076.

Adding to 1378321057 its reverse (7501238731), we get a palindrome (8879559788).

The spelling of 1378321057 in words is "one billion, three hundred seventy-eight million, three hundred twenty-one thousand, fifty-seven".