1368826681 has 4 divisors (see below), whose sum is σ = 1370626164. Its totient is φ = 1367027200.

The previous prime is 1368826673. The next prime is 1368826699. The reversal of 1368826681 is 1866288631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1866288631 = 42061 ⋅44371.

It can be written as a sum of positive squares in 2 ways, for example, as 227738281 + 1141088400 = 15091^2 + 33780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368826681 - 2³ = 1368826673 is a prime.

It is a super-2 number, since 2×1368826681² = 3747372965234951522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368826631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898600 + ... + 900121.

It is an arithmetic number, because the mean of its divisors is an integer number (342656541).

Almost surely, 2^1368826681 is an apocalyptic number.

It is an amenable number.

1368826681 is a deficient number, since it is larger than the sum of its proper divisors (1799483).

1368826681 is an equidigital number, since it uses as much as digits as its factorization.

1368826681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799482.

The product of its digits is 663552, while the sum is 49.

The square root of 1368826681 is about 36997.6577772161. The cubic root of 1368826681 is about 1110.3233862834.

The spelling of 1368826681 in words is "one billion, three hundred sixty-eight million, eight hundred twenty-six thousand, six hundred eighty-one".