381809889217 has 12 divisors (see below), whose sum is σ = 384934501908. Its totient is φ = 378710415200.

The previous prime is 381809889203. The next prime is 381809889229. The reversal of 381809889217 is 712988908183.

It can be written as a sum of positive squares in 2 ways, for example, as 240554935296 + 141254953921 = 490464^2 + 375839^2 .

It is a de Polignac number, because none of the positive numbers 2^k-381809889217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381809889277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47034243 + ... + 47042359.

It is an arithmetic number, because the mean of its divisors is an integer number (32077875159).

Almost surely, 2^381809889217 is an apocalyptic number.

It is an amenable number.

381809889217 is a deficient number, since it is larger than the sum of its proper divisors (3124612691).

381809889217 is an equidigital number, since it uses as much as digits as its factorization.

381809889217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120 (or 10989 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 64.

The spelling of 381809889217 in words is "three hundred eighty-one billion, eight hundred nine million, eight hundred eighty-nine thousand, two hundred seventeen".