13455521891 has 8 divisors (see below), whose sum is σ = 15378551904. Its totient is φ = 11532695040.

The previous prime is 13455521851. The next prime is 13455521899. The reversal of 13455521891 is 19812555431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13455521891 - 2³⁰ = 12381780067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13455521899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137861 + ... + 214281.

It is an arithmetic number, because the mean of its divisors is an integer number (1922318988).

Almost surely, 2^13455521891 is an apocalyptic number.

13455521891 is a deficient number, since it is larger than the sum of its proper divisors (1923030013).

13455521891 is an equidigital number, since it uses as much as digits as its factorization.

13455521891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101581.

The product of its digits is 216000, while the sum is 44.

The spelling of 13455521891 in words is "thirteen billion, four hundred fifty-five million, five hundred twenty-one thousand, eight hundred ninety-one".