27139733381 has 2 divisors, whose sum is σ = 27139733382. Its totient is φ = 27139733380.

The previous prime is 27139733353. The next prime is 27139733431. The reversal of 27139733381 is 18333793172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22456521025 + 4683212356 = 149855^2 + 68434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27139733381 is a prime.

It is a super-2 number, since 2×27139733381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27139733681) 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 as a sum of consecutive naturals, namely, 13569866690 + 13569866691.

It is an arithmetic number, because the mean of its divisors is an integer number (13569866691).

Almost surely, 2^27139733381 is an apocalyptic number.

It is an amenable number.

27139733381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27139733381 is an equidigital number, since it uses as much as digits as its factorization.

27139733381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 47.

The spelling of 27139733381 in words is "twenty-seven billion, one hundred thirty-nine million, seven hundred thirty-three thousand, three hundred eighty-one".