13781110549 has 4 divisors (see below), whose sum is σ = 14101601536. Its totient is φ = 13460619564.

The previous prime is 13781110517. The next prime is 13781110589. The reversal of 13781110549 is 94501118731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94501118731 = 251 ⋅376498481.

It is a cyclic number.

It is not a de Polignac number, because 13781110549 - 2⁵ = 13781110517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781110589) 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, 160245429 + ... + 160245514.

It is an arithmetic number, because the mean of its divisors is an integer number (3525400384).

Almost surely, 2^13781110549 is an apocalyptic number.

It is an amenable number.

13781110549 is a deficient number, since it is larger than the sum of its proper divisors (320490987).

13781110549 is an equidigital number, since it uses as much as digits as its factorization.

13781110549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320490986.

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 13781110549 in words is "thirteen billion, seven hundred eighty-one million, one hundred ten thousand, five hundred forty-nine".