381816749 has 2 divisors, whose sum is σ = 381816750. Its totient is φ = 381816748.

The previous prime is 381816713. The next prime is 381816763. The reversal of 381816749 is 947618183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321054724 + 60762025 = 17918^2 + 7795^2 .

It is a cyclic number.

It is not a de Polignac number, because 381816749 - 2²⁸ = 113381293 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381816769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190908374 + 190908375.

It is an arithmetic number, because the mean of its divisors is an integer number (190908375).

Almost surely, 2^381816749 is an apocalyptic number.

It is an amenable number.

381816749 is a deficient number, since it is larger than the sum of its proper divisors (1).

381816749 is an equidigital number, since it uses as much as digits as its factorization.

381816749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 381816749 is about 19540.1317549294. The cubic root of 381816749 is about 725.4681076820.

The spelling of 381816749 in words is "three hundred eighty-one million, eight hundred sixteen thousand, seven hundred forty-nine".