8138809361 has 2 divisors, whose sum is σ = 8138809362. Its totient is φ = 8138809360.

The previous prime is 8138809333. The next prime is 8138809423. The reversal of 8138809361 is 1639088318.

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., 8028160000 + 110649361 = 89600^2 + 10519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8138809361 is a prime.

It is not a weakly prime, because it can be changed into another prime (8138409361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069404680 + 4069404681.

It is an arithmetic number, because the mean of its divisors is an integer number (4069404681).

Almost surely, 2^8138809361 is an apocalyptic number.

It is an amenable number.

8138809361 is a deficient number, since it is larger than the sum of its proper divisors (1).

8138809361 is an equidigital number, since it uses as much as digits as its factorization.

8138809361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 8138809361 is about 90215.3499189578. The cubic root of 8138809361 is about 2011.5011813847.

The spelling of 8138809361 in words is "eight billion, one hundred thirty-eight million, eight hundred nine thousand, three hundred sixty-one".