27731844997 has 2 divisors, whose sum is σ = 27731844998. Its totient is φ = 27731844996.

The previous prime is 27731844967. The next prime is 27731845013. The reversal of 27731844997 is 79944813772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27478366756 + 253478241 = 165766^2 + 15921^2 .

It is a cyclic number.

It is not a de Polignac number, because 27731844997 - 2¹⁹ = 27731320709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27731844937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865922498 + 13865922499.

It is an arithmetic number, because the mean of its divisors is an integer number (13865922499).

Almost surely, 2^27731844997 is an apocalyptic number.

It is an amenable number.

27731844997 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731844997 is an equidigital number, since it uses as much as digits as its factorization.

27731844997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 61.

The spelling of 27731844997 in words is "twenty-seven billion, seven hundred thirty-one million, eight hundred forty-four thousand, nine hundred ninety-seven".