231031243 has 4 divisors (see below), whose sum is σ = 231136488. Its totient is φ = 230926000.

The previous prime is 231031223. The next prime is 231031253. The reversal of 231031243 is 342130132.

231031243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-231031243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231031243.

It is not an unprimeable number, because it can be changed into a prime (231031223) 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, 49258 + ... + 53743.

It is an arithmetic number, because the mean of its divisors is an integer number (57784122).

Almost surely, 2^231031243 is an apocalyptic number.

231031243 is a deficient number, since it is larger than the sum of its proper divisors (105245).

231031243 is a wasteful number, since it uses less digits than its factorization.

231031243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105244.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 231031243 is about 15199.7119380599. The cubic root of 231031243 is about 613.6069051381.

Adding to 231031243 its reverse (342130132), we get a palindrome (573161375).

The spelling of 231031243 in words is "two hundred thirty-one million, thirty-one thousand, two hundred forty-three".