231211242 has 12 divisors (see below), whose sum is σ = 500957730. Its totient is φ = 77070408.

The previous prime is 231211219. The next prime is 231211291. The reversal of 231211242 is 242112132.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 230705721 + 505521 = 15189^2 + 711^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12845069 = 231211242 / (2 + 3 + 1 + 2 + 1 + 1 + 2 + 4 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6422517 + ... + 6422552.

Almost surely, 2^231211242 is an apocalyptic number.

231211242 is an abundant number, since it is smaller than the sum of its proper divisors (269746488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231211242 is a wasteful number, since it uses less digits than its factorization.

231211242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845077 (or 12845074 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 231211242 is about 15205.6319171549. The cubic root of 231211242 is about 613.7662197491.

Adding to 231211242 its reverse (242112132), we get a palindrome (473323374).

The spelling of 231211242 in words is "two hundred thirty-one million, two hundred eleven thousand, two hundred forty-two".