1367639681 has 8 divisors (see below), whose sum is σ = 1498023720. Its totient is φ = 1242803968.

The previous prime is 1367639671. The next prime is 1367639683. The reversal of 1367639681 is 1869367631.

It can be written as a sum of positive squares in 4 ways, for example, as 43771456 + 1323868225 = 6616^2 + 36385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1367639681 is a prime.

It is a super-2 number, since 2×1367639681² = 3740876594091563522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1367639683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1386566 + ... + 1387551.

It is an arithmetic number, because the mean of its divisors is an integer number (187252965).

Almost surely, 2^1367639681 is an apocalyptic number.

It is an amenable number.

1367639681 is a deficient number, since it is larger than the sum of its proper divisors (130384039).

1367639681 is a wasteful number, since it uses less digits than its factorization.

1367639681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774163.

The product of its digits is 979776, while the sum is 50.

The square root of 1367639681 is about 36981.6127420100. The cubic root of 1367639681 is about 1110.0023485598.

The spelling of 1367639681 in words is "one billion, three hundred sixty-seven million, six hundred thirty-nine thousand, six hundred eighty-one".