1231031222 has 4 divisors (see below), whose sum is σ = 1846546836. Its totient is φ = 615515610.

The previous prime is 1231031213. The next prime is 1231031233. The reversal of 1231031222 is 2221301321.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1231031222.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 307757804 + ... + 307757807.

It is an arithmetic number, because the mean of its divisors is an integer number (461636709).

Almost surely, 2^1231031222 is an apocalyptic number.

1231031222 is a deficient number, since it is larger than the sum of its proper divisors (615515614).

1231031222 is an equidigital number, since it uses as much as digits as its factorization.

1231031222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615515613.

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

The square root of 1231031222 is about 35086.0545231293. The cubic root of 1231031222 is about 1071.7406152666.

Adding to 1231031222 its reverse (2221301321), we get a palindrome (3452332543).

The spelling of 1231031222 in words is "one billion, two hundred thirty-one million, thirty-one thousand, two hundred twenty-two".