378243331 has 2 divisors, whose sum is σ = 378243332. Its totient is φ = 378243330.

The previous prime is 378243329. The next prime is 378243337. The reversal of 378243331 is 133342873.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 378243331 - 2¹ = 378243329 is a prime.

It is a super-2 number, since 2×378243331² = 286136034891951122, which contains 22 as substring.

Together with 378243329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (378243337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189121665 + 189121666.

It is an arithmetic number, because the mean of its divisors is an integer number (189121666).

Almost surely, 2^378243331 is an apocalyptic number.

378243331 is a deficient number, since it is larger than the sum of its proper divisors (1).

378243331 is an equidigital number, since it uses as much as digits as its factorization.

378243331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 34.

The square root of 378243331 is about 19448.4788865351. The cubic root of 378243331 is about 723.1977947369.

The spelling of 378243331 in words is "three hundred seventy-eight million, two hundred forty-three thousand, three hundred thirty-one".