381366943 has 2 divisors, whose sum is σ = 381366944. Its totient is φ = 381366942.

The previous prime is 381366941. The next prime is 381366971. The reversal of 381366943 is 349663183.

It is a weak prime.

It is an emirp because it is prime and its reverse (349663183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381366943 - 2¹ = 381366941 is a prime.

Together with 381366941, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 381366943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381366941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190683471 + 190683472.

It is an arithmetic number, because the mean of its divisors is an integer number (190683472).

Almost surely, 2^381366943 is an apocalyptic number.

381366943 is a deficient number, since it is larger than the sum of its proper divisors (1).

381366943 is an equidigital number, since it uses as much as digits as its factorization.

381366943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 43.

The square root of 381366943 is about 19528.6185635339. The cubic root of 381366943 is about 725.1831122099.

It can be divided in two parts, 3813 and 66943, that added together give a square (70756 = 266²).

The spelling of 381366943 in words is "three hundred eighty-one million, three hundred sixty-six thousand, nine hundred forty-three".