349343839681 has 4 divisors (see below), whose sum is σ = 349346917332. Its totient is φ = 349340762032.

The previous prime is 349343839673. The next prime is 349343839697. The reversal of 349343839681 is 186938343943.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84367011600 + 264976828081 = 290460^2 + 514759^2 .

It is a cyclic number.

It is not a de Polignac number, because 349343839681 - 2³ = 349343839673 is a prime.

It is a super-2 number, since 2×349343839681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349343839781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361770 + ... + 1597843.

It is an arithmetic number, because the mean of its divisors is an integer number (87336729333).

Almost surely, 2^349343839681 is an apocalyptic number.

It is an amenable number.

349343839681 is a deficient number, since it is larger than the sum of its proper divisors (3077651).

349343839681 is a wasteful number, since it uses less digits than its factorization.

349343839681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077650.

The product of its digits is 40310784, while the sum is 61.

The spelling of 349343839681 in words is "three hundred forty-nine billion, three hundred forty-three million, eight hundred thirty-nine thousand, six hundred eighty-one".