1378809079 has 2 divisors, whose sum is σ = 1378809080. Its totient is φ = 1378809078.

The previous prime is 1378809053. The next prime is 1378809097. The reversal of 1378809079 is 9709088731.

Together with next prime (1378809097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9709088731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378809079 - 2²¹ = 1376711927 is a prime.

It is a super-2 number, since 2×1378809079² = 3802228952665656482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378809979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689404539 + 689404540.

It is an arithmetic number, because the mean of its divisors is an integer number (689404540).

Almost surely, 2^1378809079 is an apocalyptic number.

1378809079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378809079 is an equidigital number, since it uses as much as digits as its factorization.

1378809079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 1378809079 is about 37132.3185244337. The cubic root of 1378809079 is about 1113.0159247213.

The spelling of 1378809079 in words is "one billion, three hundred seventy-eight million, eight hundred nine thousand, seventy-nine".