31131543 has 16 divisors (see below), whose sum is σ = 42166656. Its totient is φ = 20428320.

The previous prime is 31131497. The next prime is 31131547. The reversal of 31131543 is 34513113.

It is not a de Polignac number, because 31131543 - 2⁹ = 31131031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93888 + ... + 94218.

It is an arithmetic number, because the mean of its divisors is an integer number (2635416).

Almost surely, 2^31131543 is an apocalyptic number.

31131543 is a deficient number, since it is larger than the sum of its proper divisors (11035113).

31131543 is a wasteful number, since it uses less digits than its factorization.

31131543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734.

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

The square root of 31131543 is about 5579.5647679725. The cubic root of 31131543 is about 314.5817679537.

Adding to 31131543 its reverse (34513113), we get a palindrome (65644656).

It can be divided in two parts, 3113 and 1543, that added together give a triangular number (4656 = T₉₆).

The spelling of 31131543 in words is "thirty-one million, one hundred thirty-one thousand, five hundred forty-three".