13988947561 has 4 divisors (see below), whose sum is σ = 13998086224. Its totient is φ = 13979808900.

The previous prime is 13988947547. The next prime is 13988947591. The reversal of 13988947561 is 16574988931.

13988947561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13988947561 - 2¹³ = 13988939369 is a prime.

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 13988947561.

It is not an unprimeable number, because it can be changed into a prime (13988947591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4567035 + ... + 4570096.

It is an arithmetic number, because the mean of its divisors is an integer number (3499521556).

Almost surely, 2^13988947561 is an apocalyptic number.

It is an amenable number.

13988947561 is a deficient number, since it is larger than the sum of its proper divisors (9138663).

13988947561 is an equidigital number, since it uses as much as digits as its factorization.

13988947561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9138662.

The product of its digits is 13063680, while the sum is 61.

The spelling of 13988947561 in words is "thirteen billion, nine hundred eighty-eight million, nine hundred forty-seven thousand, five hundred sixty-one".