13505839781 has 8 divisors (see below), whose sum is σ = 15933156864. Its totient is φ = 11203000560.

The previous prime is 13505839751. The next prime is 13505839793. The reversal of 13505839781 is 18793850531.

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

It is a cyclic number.

It is not a de Polignac number, because 13505839781 - 2¹⁰ = 13505838757 is a prime.

It is a super-2 number, since 2×13505839781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13505839751) 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 7 ways as a sum of consecutive naturals, for example, 31119230 + ... + 31119663.

It is an arithmetic number, because the mean of its divisors is an integer number (1991644608).

Almost surely, 2^13505839781 is an apocalyptic number.

It is an amenable number.

13505839781 is a deficient number, since it is larger than the sum of its proper divisors (2427317083).

13505839781 is an equidigital number, since it uses as much as digits as its factorization.

13505839781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62238931.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 13505839781 in words is "thirteen billion, five hundred five million, eight hundred thirty-nine thousand, seven hundred eighty-one".