381521713 has 2 divisors, whose sum is σ = 381521714. Its totient is φ = 381521712.

The previous prime is 381521711. The next prime is 381521737. The reversal of 381521713 is 317125183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381342784 + 178929 = 19528^2 + 423^2 .

It is an emirp because it is prime and its reverse (317125183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381521713 - 2¹ = 381521711 is a prime.

Together with 381521711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (381521711) 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, 190760856 + 190760857.

It is an arithmetic number, because the mean of its divisors is an integer number (190760857).

Almost surely, 2^381521713 is an apocalyptic number.

It is an amenable number.

381521713 is a deficient number, since it is larger than the sum of its proper divisors (1).

381521713 is an equidigital number, since it uses as much as digits as its factorization.

381521713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 381521713 is about 19532.5808074612. The cubic root of 381521713 is about 725.2811992035.

Adding to 381521713 its reverse (317125183), we get a palindrome (698646896).

The spelling of 381521713 in words is "three hundred eighty-one million, five hundred twenty-one thousand, seven hundred thirteen".