1378817449 has 2 divisors, whose sum is σ = 1378817450. Its totient is φ = 1378817448.

The previous prime is 1378817443. The next prime is 1378817467. The reversal of 1378817449 is 9447188731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 833361424 + 545456025 = 28868^2 + 23355^2 .

It is an emirp because it is prime and its reverse (9447188731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378817449 - 2⁵ = 1378817417 is a prime.

It is a super-2 number, since 2×1378817449² = 3802275115333735202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1378817396 and 1378817405.

It is not a weakly prime, because it can be changed into another prime (1378817443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689408724 + 689408725.

It is an arithmetic number, because the mean of its divisors is an integer number (689408725).

Almost surely, 2^1378817449 is an apocalyptic number.

It is an amenable number.

1378817449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378817449 is an equidigital number, since it uses as much as digits as its factorization.

1378817449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 52.

The square root of 1378817449 is about 37132.4312293176. The cubic root of 1378817449 is about 1113.0181768882.

The spelling of 1378817449 in words is "one billion, three hundred seventy-eight million, eight hundred seventeen thousand, four hundred forty-nine".