231212227 has 4 divisors (see below), whose sum is σ = 231247656. Its totient is φ = 231176800.

The previous prime is 231212213. The next prime is 231212231. The reversal of 231212227 is 722212132.

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 231212227 - 2²³ = 222823619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231212198 and 231212207.

It is not an unprimeable number, because it can be changed into a prime (231212287) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4774 + ... + 22027.

It is an arithmetic number, because the mean of its divisors is an integer number (57811914).

Almost surely, 2^231212227 is an apocalyptic number.

231212227 is a deficient number, since it is larger than the sum of its proper divisors (35429).

231212227 is an equidigital number, since it uses as much as digits as its factorization.

231212227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35428.

The product of its digits is 672, while the sum is 22.

The square root of 231212227 is about 15205.6643064353. The cubic root of 231212227 is about 613.7670913314.

Adding to 231212227 its reverse (722212132), we get a palindrome (953424359).

The spelling of 231212227 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-seven".