381743281 has 2 divisors, whose sum is σ = 381743282. Its totient is φ = 381743280.

The previous prime is 381743261. The next prime is 381743291. The reversal of 381743281 is 182347183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379626256 + 2117025 = 19484^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 381743281 - 2⁵ = 381743249 is a prime.

It is a super-2 number, since 2×381743281² = 291455865177289922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381743281.

It is not a weakly prime, because it can be changed into another prime (381743221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190871640 + 190871641.

It is an arithmetic number, because the mean of its divisors is an integer number (190871641).

Almost surely, 2^381743281 is an apocalyptic number.

It is an amenable number.

381743281 is a deficient number, since it is larger than the sum of its proper divisors (1).

381743281 is an equidigital number, since it uses as much as digits as its factorization.

381743281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 381743281 is about 19538.2517385768. The cubic root of 381743281 is about 725.4215739194.

The spelling of 381743281 in words is "three hundred eighty-one million, seven hundred forty-three thousand, two hundred eighty-one".