381881783 has 2 divisors, whose sum is σ = 381881784. Its totient is φ = 381881782.

The previous prime is 381881743. The next prime is 381881821. The reversal of 381881783 is 387188183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381881783 - 2¹² = 381877687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381881713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190940891 + 190940892.

It is an arithmetic number, because the mean of its divisors is an integer number (190940892).

Almost surely, 2^381881783 is an apocalyptic number.

381881783 is a deficient number, since it is larger than the sum of its proper divisors (1).

381881783 is an equidigital number, since it uses as much as digits as its factorization.

381881783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The square root of 381881783 is about 19541.7957977254. The cubic root of 381881783 is about 725.5092944682.

The spelling of 381881783 in words is "three hundred eighty-one million, eight hundred eighty-one thousand, seven hundred eighty-three".