13543431 has 16 divisors (see below), whose sum is σ = 19907328. Its totient is φ = 8121600.

The previous prime is 13543427. The next prime is 13543433. The reversal of 13543431 is 13434531.

It is a happy number.

13543431 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13543431 - 2² = 13543427 is a prime.

It is a super-2 number, since 2×13543431² = 366849046503522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13543433) 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 15 ways as a sum of consecutive naturals, for example, 1086 + ... + 5316.

It is an arithmetic number, because the mean of its divisors is an integer number (1244208).

Almost surely, 2^13543431 is an apocalyptic number.

13543431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13543431 is a deficient number, since it is larger than the sum of its proper divisors (6363897).

13543431 is a wasteful number, since it uses less digits than its factorization.

13543431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4342.

The product of its digits is 2160, while the sum is 24.

The square root of 13543431 is about 3680.1400788557. The cubic root of 13543431 is about 238.3652267402.

Adding to 13543431 its reverse (13434531), we get a palindrome (26977962).

Subtracting from 13543431 its reverse (13434531), we obtain a square (108900 = 330²).

The spelling of 13543431 in words is "thirteen million, five hundred forty-three thousand, four hundred thirty-one".