1368686881 has 4 divisors (see below), whose sum is σ = 1449197892. Its totient is φ = 1288175872.

The previous prime is 1368686873. The next prime is 1368686899. The reversal of 1368686881 is 1886868631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1886868631 = 83 ⋅22733357.

It can be written as a sum of positive squares in 2 ways, for example, as 604717281 + 763969600 = 24591^2 + 27640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368686881 - 2³ = 1368686873 is a prime.

It is a super-2 number, since 2×1368686881² = 3746607556443016322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368686281) 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, 40255480 + ... + 40255513.

It is an arithmetic number, because the mean of its divisors is an integer number (362299473).

Almost surely, 2^1368686881 is an apocalyptic number.

It is an amenable number.

1368686881 is a deficient number, since it is larger than the sum of its proper divisors (80511011).

1368686881 is an equidigital number, since it uses as much as digits as its factorization.

1368686881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80511010.

The product of its digits is 2654208, while the sum is 55.

The square root of 1368686881 is about 36995.7684201856. The cubic root of 1368686881 is about 1110.2855854192.

The spelling of 1368686881 in words is "one billion, three hundred sixty-eight million, six hundred eighty-six thousand, eight hundred eighty-one".