13749181 has 4 divisors (see below), whose sum is σ = 13789152. Its totient is φ = 13709212.

The previous prime is 13749149. The next prime is 13749187. The reversal of 13749181 is 18194731.

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: 18194731 = 227 ⋅80153.

It is a cyclic number.

It is not a de Polignac number, because 13749181 - 2⁵ = 13749149 is a prime.

It is a super-2 number, since 2×13749181² = 378079956341522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13749187) 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, 19465 + ... + 20158.

It is an arithmetic number, because the mean of its divisors is an integer number (3447288).

Almost surely, 2^13749181 is an apocalyptic number.

It is an amenable number.

13749181 is a deficient number, since it is larger than the sum of its proper divisors (39971).

13749181 is an equidigital number, since it uses as much as digits as its factorization.

13749181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39970.

The product of its digits is 6048, while the sum is 34.

The square root of 13749181 is about 3707.9888079658. The cubic root of 13749181 is about 239.5662361855.

The spelling of 13749181 in words is "thirteen million, seven hundred forty-nine thousand, one hundred eighty-one".