378432581 has 2 divisors, whose sum is σ = 378432582. Its totient is φ = 378432580.

The previous prime is 378432569. The next prime is 378432601. The reversal of 378432581 is 185234873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358496356 + 19936225 = 18934^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 378432581 - 2⁶ = 378432517 is a prime.

It is a super-2 number, since 2×378432581² = 286422436724643122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378432181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189216290 + 189216291.

It is an arithmetic number, because the mean of its divisors is an integer number (189216291).

Almost surely, 2^378432581 is an apocalyptic number.

It is an amenable number.

378432581 is a deficient number, since it is larger than the sum of its proper divisors (1).

378432581 is an equidigital number, since it uses as much as digits as its factorization.

378432581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 378432581 is about 19453.3436971642. The cubic root of 378432581 is about 723.3183893836.

The spelling of 378432581 in words is "three hundred seventy-eight million, four hundred thirty-two thousand, five hundred eighty-one".