381336581 has 2 divisors, whose sum is σ = 381336582. Its totient is φ = 381336580.

The previous prime is 381336569. The next prime is 381336589. The reversal of 381336581 is 185633183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374229025 + 7107556 = 19345^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 381336581 - 2²² = 377142277 is a prime.

It is a super-2 number, since 2×381336581² = 290835176017539122, 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 (381336589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190668290 + 190668291.

It is an arithmetic number, because the mean of its divisors is an integer number (190668291).

Almost surely, 2^381336581 is an apocalyptic number.

It is an amenable number.

381336581 is a deficient number, since it is larger than the sum of its proper divisors (1).

381336581 is an equidigital number, since it uses as much as digits as its factorization.

381336581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 381336581 is about 19527.8411761259. The cubic root of 381336581 is about 725.1638668834.

The spelling of 381336581 in words is "three hundred eighty-one million, three hundred thirty-six thousand, five hundred eighty-one".