423243131531 has 4 divisors (see below), whose sum is σ = 461719779864. Its totient is φ = 384766483200.

The previous prime is 423243131513. The next prime is 423243131581. The reversal of 423243131531 is 135131342324.

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

It is a de Polignac number, because none of the positive numbers 2^k-423243131531 is a prime.

It is a super-2 number, since 2×423243131531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423243131581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19238324150 + ... + 19238324171.

It is an arithmetic number, because the mean of its divisors is an integer number (115429944966).

Almost surely, 2^423243131531 is an apocalyptic number.

423243131531 is a deficient number, since it is larger than the sum of its proper divisors (38476648333).

423243131531 is a wasteful number, since it uses less digits than its factorization.

423243131531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38476648332.

The product of its digits is 25920, while the sum is 32.

Adding to 423243131531 its reverse (135131342324), we get a palindrome (558374473855).

The spelling of 423243131531 in words is "four hundred twenty-three billion, two hundred forty-three million, one hundred thirty-one thousand, five hundred thirty-one".