13749121 has 4 divisors (see below), whose sum is σ = 14068912. Its totient is φ = 13429332.

The previous prime is 13749119. The next prime is 13749133. The reversal of 13749121 is 12194731.

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 13749121 - 2¹ = 13749119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13749121.

It is not an unprimeable number, because it can be changed into a prime (13749191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159831 + ... + 159916.

It is an arithmetic number, because the mean of its divisors is an integer number (3517228).

Almost surely, 2^13749121 is an apocalyptic number.

It is an amenable number.

13749121 is a deficient number, since it is larger than the sum of its proper divisors (319791).

13749121 is an equidigital number, since it uses as much as digits as its factorization.

13749121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319790.

The product of its digits is 1512, while the sum is 28.

The square root of 13749121 is about 3707.9807173177. The cubic root of 13749121 is about 239.5658877043.

The spelling of 13749121 in words is "thirteen million, seven hundred forty-nine thousand, one hundred twenty-one".