13121143 has 4 divisors (see below), whose sum is σ = 14995600. Its totient is φ = 11246688.

The previous prime is 13121117. The next prime is 13121159. The reversal of 13121143 is 34112131.

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 13121143 - 2⁹ = 13120631 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 (13121243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937218 + ... + 937231.

It is an arithmetic number, because the mean of its divisors is an integer number (3748900).

Almost surely, 2^13121143 is an apocalyptic number.

13121143 is a deficient number, since it is larger than the sum of its proper divisors (1874457).

13121143 is an equidigital number, since it uses as much as digits as its factorization.

13121143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874456.

The product of its digits is 72, while the sum is 16.

The square root of 13121143 is about 3622.3118308616. The cubic root of 13121143 is about 235.8615905353.

Adding to 13121143 its reverse (34112131), we get a palindrome (47233274).

The spelling of 13121143 in words is "thirteen million, one hundred twenty-one thousand, one hundred forty-three".