27831309026981 has 2 divisors, whose sum is σ = 27831309026982. Its totient is φ = 27831309026980.

The previous prime is 27831309026977. The next prime is 27831309027047. The reversal of 27831309026981 is 18962090313872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24905040345025 + 2926268681956 = 4990495^2 + 1710634^2 .

It is a cyclic number.

It is not a de Polignac number, because 27831309026981 - 2² = 27831309026977 is a prime.

It is a super-2 number, since 2×27831309026981² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27831309026981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27831309022981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13915654513490 + 13915654513491.

It is an arithmetic number, because the mean of its divisors is an integer number (13915654513491).

Almost surely, 2^{27831309026981} is an apocalyptic number.

It is an amenable number.

27831309026981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27831309026981 is an equidigital number, since it uses as much as digits as its factorization.

27831309026981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 27831309026981 in words is "twenty-seven trillion, eight hundred thirty-one billion, three hundred nine million, twenty-six thousand, nine hundred eighty-one".