231211243 has 4 divisors (see below), whose sum is σ = 231748128. Its totient is φ = 230674360.

The previous prime is 231211219. The next prime is 231211291. The reversal of 231211243 is 342112132.

It is a happy number.

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 231211243 - 2⁹ = 231210731 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 231211243.

It is not an unprimeable number, because it can be changed into a prime (231211843) 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, 267796 + ... + 268657.

It is an arithmetic number, because the mean of its divisors is an integer number (57937032).

Almost surely, 2^231211243 is an apocalyptic number.

231211243 is a deficient number, since it is larger than the sum of its proper divisors (536885).

231211243 is an equidigital number, since it uses as much as digits as its factorization.

231211243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536884.

The product of its digits is 288, while the sum is 19.

The square root of 231211243 is about 15205.6319500375. The cubic root of 231211243 is about 613.7662206339.

Adding to 231211243 its reverse (342112132), we get a palindrome (573323375).

The spelling of 231211243 in words is "two hundred thirty-one million, two hundred eleven thousand, two hundred forty-three".