378705161 has 2 divisors, whose sum is σ = 378705162. Its totient is φ = 378705160.

The previous prime is 378705091. The next prime is 378705163. The reversal of 378705161 is 161507873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373687561 + 5017600 = 19331^2 + 2240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378705161 is a prime.

It is a Sophie Germain prime.

Together with 378705163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (378705163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189352580 + 189352581.

It is an arithmetic number, because the mean of its divisors is an integer number (189352581).

Almost surely, 2^378705161 is an apocalyptic number.

It is an amenable number.

378705161 is a deficient number, since it is larger than the sum of its proper divisors (1).

378705161 is an equidigital number, since it uses as much as digits as its factorization.

378705161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 378705161 is about 19460.3484295631. The cubic root of 378705161 is about 723.4920132712.

The spelling of 378705161 in words is "three hundred seventy-eight million, seven hundred five thousand, one hundred sixty-one".