27831138061 has 2 divisors, whose sum is σ = 27831138062. Its totient is φ = 27831138060.

The previous prime is 27831138059. The next prime is 27831138121. The reversal of 27831138061 is 16083113872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21806428900 + 6024709161 = 147670^2 + 77619^2 .

It is a cyclic number.

It is not a de Polignac number, because 27831138061 - 2¹ = 27831138059 is a prime.

Together with 27831138059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27831138761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13915569030 + 13915569031.

It is an arithmetic number, because the mean of its divisors is an integer number (13915569031).

Almost surely, 2^27831138061 is an apocalyptic number.

It is an amenable number.

27831138061 is a deficient number, since it is larger than the sum of its proper divisors (1).

27831138061 is an equidigital number, since it uses as much as digits as its factorization.

27831138061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 27831138061 in words is "twenty-seven billion, eight hundred thirty-one million, one hundred thirty-eight thousand, sixty-one".