131242543 has 4 divisors (see below), whose sum is σ = 131437080. Its totient is φ = 131048008.

The previous prime is 131242541. The next prime is 131242571. The reversal of 131242543 is 345242131.

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 131242543 - 2¹ = 131242541 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 (131242541) 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, 96253 + ... + 97606.

It is an arithmetic number, because the mean of its divisors is an integer number (32859270).

Almost surely, 2^131242543 is an apocalyptic number.

131242543 is a deficient number, since it is larger than the sum of its proper divisors (194537).

131242543 is an equidigital number, since it uses as much as digits as its factorization.

131242543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194536.

The product of its digits is 2880, while the sum is 25.

The square root of 131242543 is about 11456.1137826053. The cubic root of 131242543 is about 508.1885537583.

Adding to 131242543 its reverse (345242131), we get a palindrome (476484674).

The spelling of 131242543 in words is "one hundred thirty-one million, two hundred forty-two thousand, five hundred forty-three".