838581571117 has 2 divisors, whose sum is σ = 838581571118. Its totient is φ = 838581571116.

The previous prime is 838581571067. The next prime is 838581571123. The reversal of 838581571117 is 711175185838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564310454436 + 274271116681 = 751206^2 + 523709^2 .

It is a cyclic number.

It is not a de Polignac number, because 838581571117 - 2²³ = 838573182509 is a prime.

It is a super-2 number, since 2×838581571117² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838581571127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419290785558 + 419290785559.

It is an arithmetic number, because the mean of its divisors is an integer number (419290785559).

Almost surely, 2^838581571117 is an apocalyptic number.

It is an amenable number.

838581571117 is a deficient number, since it is larger than the sum of its proper divisors (1).

838581571117 is an equidigital number, since it uses as much as digits as its factorization.

838581571117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881600, while the sum is 55.

The spelling of 838581571117 in words is "eight hundred thirty-eight billion, five hundred eighty-one million, five hundred seventy-one thousand, one hundred seventeen".