381303581 has 2 divisors, whose sum is σ = 381303582. Its totient is φ = 381303580.

The previous prime is 381303569. The next prime is 381303589. The reversal of 381303581 is 185303183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375972100 + 5331481 = 19390^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 381303581 - 2¹⁰ = 381302557 is a prime.

It is a super-2 number, since 2×381303581² = 290784841766847122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381303589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190651790 + 190651791.

It is an arithmetic number, because the mean of its divisors is an integer number (190651791).

Almost surely, 2^381303581 is an apocalyptic number.

It is an amenable number.

381303581 is a deficient number, since it is larger than the sum of its proper divisors (1).

381303581 is an equidigital number, since it uses as much as digits as its factorization.

381303581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 381303581 is about 19526.9962103750. The cubic root of 381303581 is about 725.1429482696.

The spelling of 381303581 in words is "three hundred eighty-one million, three hundred three thousand, five hundred eighty-one".