381383909 has 2 divisors, whose sum is σ = 381383910. Its totient is φ = 381383908.

The previous prime is 381383887. The next prime is 381383939. The reversal of 381383909 is 909383183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317623684 + 63760225 = 17822^2 + 7985^2 .

It is an emirp because it is prime and its reverse (909383183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381383909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381383909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381383939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190691954 + 190691955.

It is an arithmetic number, because the mean of its divisors is an integer number (190691955).

Almost surely, 2^381383909 is an apocalyptic number.

It is an amenable number.

381383909 is a deficient number, since it is larger than the sum of its proper divisors (1).

381383909 is an equidigital number, since it uses as much as digits as its factorization.

381383909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 381383909 is about 19529.0529468277. The cubic root of 381383909 is about 725.1938658724.

The spelling of 381383909 in words is "three hundred eighty-one million, three hundred eighty-three thousand, nine hundred nine".