13871640961 has 4 divisors (see below), whose sum is σ = 13871913300. Its totient is φ = 13871368624.

The previous prime is 13871640953. The next prime is 13871640971. The reversal of 13871640961 is 16904617831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16904617831 = 37 ⋅456881563.

It can be written as a sum of positive squares in 2 ways, for example, as 4300736400 + 9570904561 = 65580^2 + 97831^2 .

It is a cyclic number.

It is not a de Polignac number, because 13871640961 - 2³ = 13871640953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13871640911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34426 + ... + 170083.

It is an arithmetic number, because the mean of its divisors is an integer number (3467978325).

Almost surely, 2^13871640961 is an apocalyptic number.

It is an amenable number.

13871640961 is a deficient number, since it is larger than the sum of its proper divisors (272339).

13871640961 is an equidigital number, since it uses as much as digits as its factorization.

13871640961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272338.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 13871640961 in words is "thirteen billion, eight hundred seventy-one million, six hundred forty thousand, nine hundred sixty-one".