27951334181 has 2 divisors, whose sum is σ = 27951334182. Its totient is φ = 27951334180.

The previous prime is 27951334163. The next prime is 27951334289. The reversal of 27951334181 is 18143315972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27710929156 + 240405025 = 166466^2 + 15505^2 .

It is a cyclic number.

It is not a de Polignac number, because 27951334181 - 2²² = 27947139877 is a prime.

It is a super-2 number, since 2×27951334181² (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 (27951334111) 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, 13975667090 + 13975667091.

It is an arithmetic number, because the mean of its divisors is an integer number (13975667091).

Almost surely, 2^27951334181 is an apocalyptic number.

It is an amenable number.

27951334181 is a deficient number, since it is larger than the sum of its proper divisors (1).

27951334181 is an equidigital number, since it uses as much as digits as its factorization.

27951334181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The spelling of 27951334181 in words is "twenty-seven billion, nine hundred fifty-one million, three hundred thirty-four thousand, one hundred eighty-one".