378745109 has 2 divisors, whose sum is σ = 378745110. Its totient is φ = 378745108.

The previous prime is 378745099. The next prime is 378745123. The reversal of 378745109 is 901547873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284596900 + 94148209 = 16870^2 + 9703^2 .

It is an emirp because it is prime and its reverse (901547873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378745109 - 2²⁸ = 110309653 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 378745109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378745139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189372554 + 189372555.

It is an arithmetic number, because the mean of its divisors is an integer number (189372555).

Almost surely, 2^378745109 is an apocalyptic number.

It is an amenable number.

378745109 is a deficient number, since it is larger than the sum of its proper divisors (1).

378745109 is an equidigital number, since it uses as much as digits as its factorization.

378745109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 378745109 is about 19461.3747972747. The cubic root of 378745109 is about 723.5174517440.

The spelling of 378745109 in words is "three hundred seventy-eight million, seven hundred forty-five thousand, one hundred nine".