381118447 has 2 divisors, whose sum is σ = 381118448. Its totient is φ = 381118446.

The previous prime is 381118363. The next prime is 381118459. The reversal of 381118447 is 744811183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381118447 - 2¹¹ = 381116399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381118547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190559223 + 190559224.

It is an arithmetic number, because the mean of its divisors is an integer number (190559224).

Almost surely, 2^381118447 is an apocalyptic number.

381118447 is a deficient number, since it is larger than the sum of its proper divisors (1).

381118447 is an equidigital number, since it uses as much as digits as its factorization.

381118447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 381118447 is about 19522.2551719826. The cubic root of 381118447 is about 725.0255699265.

It can be divided in two parts, 381 and 118447, that added together give a triangular number (118828 = T₄₈₇).

The spelling of 381118447 in words is "three hundred eighty-one million, one hundred eighteen thousand, four hundred forty-seven".