13531143 has 4 divisors (see below), whose sum is σ = 18041528. Its totient is φ = 9020760.

The previous prime is 13531129. The next prime is 13531157. The reversal of 13531143 is 34113531.

13531143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13531129) and next prime (13531157).

It is not a de Polignac number, because 13531143 - 2⁴ = 13531127 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531103) 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, 2255188 + ... + 2255193.

It is an arithmetic number, because the mean of its divisors is an integer number (4510382).

Almost surely, 2^13531143 is an apocalyptic number.

13531143 is a deficient number, since it is larger than the sum of its proper divisors (4510385).

13531143 is an equidigital number, since it uses as much as digits as its factorization.

13531143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510384.

The product of its digits is 540, while the sum is 21.

The square root of 13531143 is about 3678.4701983297. The cubic root of 13531143 is about 238.2931150723.

Adding to 13531143 its reverse (34113531), we get a palindrome (47644674).

The spelling of 13531143 in words is "thirteen million, five hundred thirty-one thousand, one hundred forty-three".