378646481 has 2 divisors, whose sum is σ = 378646482. Its totient is φ = 378646480.

The previous prime is 378646451. The next prime is 378646487. The reversal of 378646481 is 184646873.

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., 375739456 + 2907025 = 19384^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 378646481 - 2¹⁴ = 378630097 is a prime.

It is a super-2 number, since 2×378646481² = 286746315147366722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378646487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189323240 + 189323241.

It is an arithmetic number, because the mean of its divisors is an integer number (189323241).

Almost surely, 2^378646481 is an apocalyptic number.

It is an amenable number.

378646481 is a deficient number, since it is larger than the sum of its proper divisors (1).

378646481 is an equidigital number, since it uses as much as digits as its factorization.

378646481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The square root of 378646481 is about 19458.8406900308. The cubic root of 378646481 is about 723.4546432108.

The spelling of 378646481 in words is "three hundred seventy-eight million, six hundred forty-six thousand, four hundred eighty-one".