1368538081 has 16 divisors (see below), whose sum is σ = 1424174400. Its totient is φ = 1314109440.

The previous prime is 1368538007. The next prime is 1368538117. The reversal of 1368538081 is 1808358631.

It is a 3-Lehmer number, since φ(1368538081) divides (1368538081-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1368538081 - 2¹³ = 1368529889 is a prime.

It is a super-2 number, since 2×1368538081² = 3745792958294325122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a deceptive number, since it divides R_1368538080.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368538481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1408926 + ... + 1409896.

It is an arithmetic number, because the mean of its divisors is an integer number (89010900).

Almost surely, 2^1368538081 is an apocalyptic number.

It is an amenable number.

1368538081 is a deficient number, since it is larger than the sum of its proper divisors (55636319).

1368538081 is an equidigital number, since it uses as much as digits as its factorization.

1368538081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1368538081 is about 36993.7573247163. The cubic root of 1368538081 is about 1110.2453481951.

The spelling of 1368538081 in words is "one billion, three hundred sixty-eight million, five hundred thirty-eight thousand, eighty-one".