13889615531 has 6 divisors (see below), whose sum is σ = 15267098196. Its totient is φ = 12626923100.

The previous prime is 13889615479. The next prime is 13889615533. The reversal of 13889615531 is 13551698831.

It is a de Polignac number, because none of the positive numbers 2^k-13889615531 is a prime.

It is a super-2 number, since 2×13889615531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13889615531.

It is not an unprimeable number, because it can be changed into a prime (13889615533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57394985 + ... + 57395226.

It is an arithmetic number, because the mean of its divisors is an integer number (2544516366).

Almost surely, 2^13889615531 is an apocalyptic number.

13889615531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13889615531 is a deficient number, since it is larger than the sum of its proper divisors (1377482665).

13889615531 is a wasteful number, since it uses less digits than its factorization.

13889615531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114790233 (or 114790222 counting only the distinct ones).

The product of its digits is 777600, while the sum is 50.

The spelling of 13889615531 in words is "thirteen billion, eight hundred eighty-nine million, six hundred fifteen thousand, five hundred thirty-one".