1368281081 has 2 divisors, whose sum is σ = 1368281082. Its totient is φ = 1368281080.

The previous prime is 1368281077. The next prime is 1368281087. The reversal of 1368281081 is 1801828631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191630400 + 176650681 = 34520^2 + 13291^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368281081 - 2² = 1368281077 is a prime.

It is a super-2 number, since 2×1368281081² = 3744386233245057122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1368281087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684140540 + 684140541.

It is an arithmetic number, because the mean of its divisors is an integer number (684140541).

Almost surely, 2^1368281081 is an apocalyptic number.

It is an amenable number.

1368281081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368281081 is an equidigital number, since it uses as much as digits as its factorization.

1368281081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1368281081 is about 36990.2836025895. The cubic root of 1368281081 is about 1110.1758455822.

The spelling of 1368281081 in words is "one billion, three hundred sixty-eight million, two hundred eighty-one thousand, eighty-one".