1378109569 has 2 divisors, whose sum is σ = 1378109570. Its totient is φ = 1378109568.

The previous prime is 1378109543. The next prime is 1378109587. The reversal of 1378109569 is 9659018731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972691344 + 405418225 = 31188^2 + 20135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378109569 - 2²⁷ = 1243891841 is a prime.

It is a super-2 number, since 2×1378109569² = 3798371968338731522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1378109069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689054784 + 689054785.

It is an arithmetic number, because the mean of its divisors is an integer number (689054785).

Almost surely, 2^1378109569 is an apocalyptic number.

It is an amenable number.

1378109569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378109569 is an equidigital number, since it uses as much as digits as its factorization.

1378109569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1378109569 is about 37122.8981761931. The cubic root of 1378109569 is about 1112.8276710848.

The spelling of 1378109569 in words is "one billion, three hundred seventy-eight million, one hundred nine thousand, five hundred sixty-nine".