231222311 has 4 divisors (see below), whose sum is σ = 231267624. Its totient is φ = 231177000.

The previous prime is 231222283. The next prime is 231222319. The reversal of 231222311 is 113222132.

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 231222311 - 2²² = 227028007 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 231222311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231222319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13865 + ... + 25586.

It is an arithmetic number, because the mean of its divisors is an integer number (57816906).

Almost surely, 2^231222311 is an apocalyptic number.

231222311 is a deficient number, since it is larger than the sum of its proper divisors (45313).

231222311 is an equidigital number, since it uses as much as digits as its factorization.

231222311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45312.

The product of its digits is 144, while the sum is 17.

The square root of 231222311 is about 15205.9958897798. The cubic root of 231222311 is about 613.7760140679.

Adding to 231222311 its reverse (113222132), we get a palindrome (344444443).

The spelling of 231222311 in words is "two hundred thirty-one million, two hundred twenty-two thousand, three hundred eleven".