1378365269 has 2 divisors, whose sum is σ = 1378365270. Its totient is φ = 1378365268.

The previous prime is 1378365251. The next prime is 1378365271. The reversal of 1378365269 is 9625638731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 759002500 + 619362769 = 27550^2 + 24887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378365269 is a prime.

It is a super-2 number, since 2×1378365269² = 3799781629570884722, which contains 22 as substring.

Together with 1378365271, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378368269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689182634 + 689182635.

It is an arithmetic number, because the mean of its divisors is an integer number (689182635).

Almost surely, 2^1378365269 is an apocalyptic number.

It is an amenable number.

1378365269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378365269 is an equidigital number, since it uses as much as digits as its factorization.

1378365269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 1378365269 is about 37126.3419824792. The cubic root of 1378365269 is about 1112.8964930045.

The spelling of 1378365269 in words is "one billion, three hundred seventy-eight million, three hundred sixty-five thousand, two hundred sixty-nine".