1231212223 has 2 divisors, whose sum is σ = 1231212224. Its totient is φ = 1231212222.

The previous prime is 1231212221. The next prime is 1231212253. The reversal of 1231212223 is 3222121321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231212223 - 2¹ = 1231212221 is a prime.

Together with 1231212221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1231212223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231212221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615606111 + 615606112.

It is an arithmetic number, because the mean of its divisors is an integer number (615606112).

Almost surely, 2^1231212223 is an apocalyptic number.

1231212223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231212223 is an equidigital number, since it uses as much as digits as its factorization.

1231212223 is an evil number, because the sum of its binary digits is even.

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

The square root of 1231212223 is about 35088.6338149550. The cubic root of 1231212223 is about 1071.7931394195.

Adding to 1231212223 its reverse (3222121321), we get a palindrome (4453333544).

The spelling of 1231212223 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-three".