381365639 has 2 divisors, whose sum is σ = 381365640. Its totient is φ = 381365638.

The previous prime is 381365591. The next prime is 381365659. The reversal of 381365639 is 936563183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381365639 - 2¹² = 381361543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381365639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381365659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190682819 + 190682820.

It is an arithmetic number, because the mean of its divisors is an integer number (190682820).

Almost surely, 2^381365639 is an apocalyptic number.

381365639 is a deficient number, since it is larger than the sum of its proper divisors (1).

381365639 is an equidigital number, since it uses as much as digits as its factorization.

381365639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 381365639 is about 19528.5851766071. The cubic root of 381365639 is about 725.1822856744.

The spelling of 381365639 in words is "three hundred eighty-one million, three hundred sixty-five thousand, six hundred thirty-nine".