378739561 has 2 divisors, whose sum is σ = 378739562. Its totient is φ = 378739560.

The previous prime is 378739531. The next prime is 378739577. The reversal of 378739561 is 165937873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378691600 + 47961 = 19460^2 + 219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378739561 is a prime.

It is a super-3 number, since 3×378739561³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378739531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189369780 + 189369781.

It is an arithmetic number, because the mean of its divisors is an integer number (189369781).

Almost surely, 2^378739561 is an apocalyptic number.

It is an amenable number.

378739561 is a deficient number, since it is larger than the sum of its proper divisors (1).

378739561 is an equidigital number, since it uses as much as digits as its factorization.

378739561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 378739561 is about 19461.2322580046. The cubic root of 378739561 is about 723.5139189420.

The spelling of 378739561 in words is "three hundred seventy-eight million, seven hundred thirty-nine thousand, five hundred sixty-one".