378777569 has 2 divisors, whose sum is σ = 378777570. Its totient is φ = 378777568.

The previous prime is 378777563. The next prime is 378777571. The reversal of 378777569 is 965777873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211411600 + 167365969 = 14540^2 + 12937^2 .

It is an emirp because it is prime and its reverse (965777873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378777569 is a prime.

It is a super-3 number, since 3×378777569³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 378777571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378777563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189388784 + 189388785.

It is an arithmetic number, because the mean of its divisors is an integer number (189388785).

Almost surely, 2^378777569 is an apocalyptic number.

It is an amenable number.

378777569 is a deficient number, since it is larger than the sum of its proper divisors (1).

378777569 is an equidigital number, since it uses as much as digits as its factorization.

378777569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15558480, while the sum is 59.

The square root of 378777569 is about 19462.2087389895. The cubic root of 378777569 is about 723.5381206187.

The spelling of 378777569 in words is "three hundred seventy-eight million, seven hundred seventy-seven thousand, five hundred sixty-nine".