231212311 has 8 divisors (see below), whose sum is σ = 265507200. Its totient is φ = 199130040.

The previous prime is 231212309. The next prime is 231212321. The reversal of 231212311 is 113212132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231212311 - 2¹ = 231212309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552931 + ... + 553348.

It is an arithmetic number, because the mean of its divisors is an integer number (33188400).

Almost surely, 2^231212311 is an apocalyptic number.

231212311 is a deficient number, since it is larger than the sum of its proper divisors (34294889).

231212311 is a wasteful number, since it uses less digits than its factorization.

231212311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106309.

The product of its digits is 72, while the sum is 16.

The square root of 231212311 is about 15205.6670685636. The cubic root of 231212311 is about 613.7671656591.

Adding to 231212311 its reverse (113212132), we get a palindrome (344424443).

The spelling of 231212311 in words is "two hundred thirty-one million, two hundred twelve thousand, three hundred eleven".