1368538481 has 2 divisors, whose sum is σ = 1368538482. Its totient is φ = 1368538480.

The previous prime is 1368538469. The next prime is 1368538487. The reversal of 1368538481 is 1848358631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1367520400 + 1018081 = 36980^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368538481 - 2¹⁸ = 1368276337 is a prime.

It is a super-2 number, since 2×1368538481² = 3745795147955574722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1368538487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684269240 + 684269241.

It is an arithmetic number, because the mean of its divisors is an integer number (684269241).

Almost surely, 2^1368538481 is an apocalyptic number.

It is an amenable number.

1368538481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368538481 is an equidigital number, since it uses as much as digits as its factorization.

1368538481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 47.

The square root of 1368538481 is about 36993.7627310335. The cubic root of 1368538481 is about 1110.2454563636.

The spelling of 1368538481 in words is "one billion, three hundred sixty-eight million, five hundred thirty-eight thousand, four hundred eighty-one".