13555147891 has 4 divisors (see below), whose sum is σ = 13572684432. Its totient is φ = 13537611352.

The previous prime is 13555147843. The next prime is 13555147901. The reversal of 13555147891 is 19874155531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13555147891 - 2⁹ = 13555147379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13555141891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8767111 + ... + 8768656.

It is an arithmetic number, because the mean of its divisors is an integer number (3393171108).

Almost surely, 2^13555147891 is an apocalyptic number.

13555147891 is a deficient number, since it is larger than the sum of its proper divisors (17536541).

13555147891 is an equidigital number, since it uses as much as digits as its factorization.

13555147891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17536540.

The product of its digits is 756000, while the sum is 49.

The spelling of 13555147891 in words is "thirteen billion, five hundred fifty-five million, one hundred forty-seven thousand, eight hundred ninety-one".