231533423 has 4 divisors (see below), whose sum is σ = 252581928. Its totient is φ = 210484920.

The previous prime is 231533381. The next prime is 231533431. The reversal of 231533423 is 324335132.

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-231533423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231533392 and 231533401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231533453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10524236 + ... + 10524257.

It is an arithmetic number, because the mean of its divisors is an integer number (63145482).

Almost surely, 2^231533423 is an apocalyptic number.

231533423 is a deficient number, since it is larger than the sum of its proper divisors (21048505).

231533423 is a wasteful number, since it uses less digits than its factorization.

231533423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21048504.

The product of its digits is 6480, while the sum is 26.

The square root of 231533423 is about 15216.2223629914. Note that the first 3 decimals coincide. The cubic root of 231533423 is about 614.0511713445.

Adding to 231533423 its reverse (324335132), we get a palindrome (555868555).

The spelling of 231533423 in words is "two hundred thirty-one million, five hundred thirty-three thousand, four hundred twenty-three".