1368769681 has 4 divisors (see below), whose sum is σ = 1368848164. Its totient is φ = 1368691200.

The previous prime is 1368769651. The next prime is 1368769693. The reversal of 1368769681 is 1869678631.

1368769681 is a nontrivial binomial coefficient, being equal to C(52322, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 361342081 + 1007427600 = 19009^2 + 31740^2 .

It is a 3-Lehmer number, since φ(1368769681) divides (1368769681-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1368769681 - 2¹¹ = 1368767633 is a prime.

It is a super-2 number, since 2×1368769681² = 3747060879249683522, which contains 22 as substring.

It is a deceptive number, since it divides R_1368769680.

It is not an unprimeable number, because it can be changed into a prime (1368769621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 52321.

It is an arithmetic number, because the mean of its divisors is an integer number (342212041).

It is a Poulet number, since it divides 2^1368769680-1.

Almost surely, 2^1368769681 is an apocalyptic number.

1368769681 is the 52321-st triangular number and also the 26161-st hexagonal number.

1368769681 is the 17441-st centered nonagonal number.

It is an amenable number.

1368769681 is a deficient number, since it is larger than the sum of its proper divisors (78483).

1368769681 is an equidigital number, since it uses as much as digits as its factorization.

1368769681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78482.

The product of its digits is 2612736, while the sum is 55.

The square root of 1368769681 is about 36996.8874501626. The cubic root of 1368769681 is about 1110.3079742246.

The spelling of 1368769681 in words is "one billion, three hundred sixty-eight million, seven hundred sixty-nine thousand, six hundred eighty-one".