378266081 has 2 divisors, whose sum is σ = 378266082. Its totient is φ = 378266080.

The previous prime is 378266069. The next prime is 378266089. The reversal of 378266081 is 180662873.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377952481 + 313600 = 19441^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 378266081 - 2¹⁸ = 378003937 is a prime.

It is a super-2 number, since 2×378266081² = 286170456070197122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378266089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189133040 + 189133041.

It is an arithmetic number, because the mean of its divisors is an integer number (189133041).

Almost surely, 2^378266081 is an apocalyptic number.

It is an amenable number.

378266081 is a deficient number, since it is larger than the sum of its proper divisors (1).

378266081 is an equidigital number, since it uses as much as digits as its factorization.

378266081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 378266081 is about 19449.0637563868. The cubic root of 378266081 is about 723.2122937103.

The spelling of 378266081 in words is "three hundred seventy-eight million, two hundred sixty-six thousand, eighty-one".