13539383781 has 32 divisors (see below), whose sum is σ = 22573943808. Its totient is φ = 7012535040.

The previous prime is 13539383747. The next prime is 13539383783. The reversal of 13539383781 is 18738393531.

It is not a de Polignac number, because 13539383781 - 2¹⁷ = 13539252709 is a prime.

It is a super-2 number, since 2×13539383781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13539383783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9115 + ... + 164808.

It is an arithmetic number, because the mean of its divisors is an integer number (705435744).

Almost surely, 2^13539383781 is an apocalyptic number.

13539383781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13539383781 is a deficient number, since it is larger than the sum of its proper divisors (9034560027).

13539383781 is a wasteful number, since it uses less digits than its factorization.

13539383781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174281.

The product of its digits is 1632960, while the sum is 51.

The spelling of 13539383781 in words is "thirteen billion, five hundred thirty-nine million, three hundred eighty-three thousand, seven hundred eighty-one".