423511531 has 4 divisors (see below), whose sum is σ = 448423992. Its totient is φ = 398599072.

The previous prime is 423511519. The next prime is 423511537. The reversal of 423511531 is 135115324.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423511531 is a prime.

It is a super-2 number, since 2×423511531² = 358724033779927922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423511496 and 423511505.

It is not an unprimeable number, because it can be changed into a prime (423511537) 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, 12456205 + ... + 12456238.

It is an arithmetic number, because the mean of its divisors is an integer number (112105998).

Almost surely, 2^423511531 is an apocalyptic number.

423511531 is a deficient number, since it is larger than the sum of its proper divisors (24912461).

423511531 is a wasteful number, since it uses less digits than its factorization.

423511531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24912460.

The product of its digits is 1800, while the sum is 25.

The square root of 423511531 is about 20579.3957880206. The cubic root of 423511531 is about 750.9685448376.

Adding to 423511531 its reverse (135115324), we get a palindrome (558626855).

The spelling of 423511531 in words is "four hundred twenty-three million, five hundred eleven thousand, five hundred thirty-one".