8135389181 has 2 divisors, whose sum is σ = 8135389182. Its totient is φ = 8135389180.

The previous prime is 8135389139. The next prime is 8135389313. The reversal of 8135389181 is 1819835318.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6799486681 + 1335902500 = 82459^2 + 36550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8135389181 is a prime.

It is a super-2 number, since 2×8135389181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8135389481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4067694590 + 4067694591.

It is an arithmetic number, because the mean of its divisors is an integer number (4067694591).

Almost surely, 2^8135389181 is an apocalyptic number.

It is an amenable number.

8135389181 is a deficient number, since it is larger than the sum of its proper divisors (1).

8135389181 is an equidigital number, since it uses as much as digits as its factorization.

8135389181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 8135389181 is about 90196.3922837272. The cubic root of 8135389181 is about 2011.2193768554.

The spelling of 8135389181 in words is "eight billion, one hundred thirty-five million, three hundred eighty-nine thousand, one hundred eighty-one".