1343638681 has 16 divisors (see below), whose sum is σ = 1678451328. Its totient is φ = 1044950400.

The previous prime is 1343638663. The next prime is 1343638687. The reversal of 1343638681 is 1868363431.

It is a cyclic number.

It is not a de Polignac number, because 1343638681 - 2⁷ = 1343638553 is a prime.

It is a super-2 number, since 2×1343638681² = 3610729810158839522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1343638687) 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, 23371 + ... + 56863.

It is an arithmetic number, because the mean of its divisors is an integer number (104903208).

Almost surely, 2^1343638681 is an apocalyptic number.

1343638681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1343638681 is a deficient number, since it is larger than the sum of its proper divisors (334812647).

1343638681 is a wasteful number, since it uses less digits than its factorization.

1343638681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34032.

The product of its digits is 248832, while the sum is 43.

The square root of 1343638681 is about 36655.6773365327. The cubic root of 1343638681 is about 1103.4707676687.

The spelling of 1343638681 in words is "one billion, three hundred forty-three million, six hundred thirty-eight thousand, six hundred eighty-one".