115638671381 has 2 divisors, whose sum is σ = 115638671382. Its totient is φ = 115638671380.

The previous prime is 115638671377. The next prime is 115638671387. The reversal of 115638671381 is 183176836511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90260588356 + 25378083025 = 300434^2 + 159305^2 .

It is a cyclic number.

It is not a de Polignac number, because 115638671381 - 2² = 115638671377 is a prime.

It is a super-2 number, since 2×115638671381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115638671387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57819335690 + 57819335691.

It is an arithmetic number, because the mean of its divisors is an integer number (57819335691).

Almost surely, 2^115638671381 is an apocalyptic number.

It is an amenable number.

115638671381 is a deficient number, since it is larger than the sum of its proper divisors (1).

115638671381 is an equidigital number, since it uses as much as digits as its factorization.

115638671381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The spelling of 115638671381 in words is "one hundred fifteen billion, six hundred thirty-eight million, six hundred seventy-one thousand, three hundred eighty-one".