1231312216 has 16 divisors (see below), whose sum is σ = 2309315040. Its totient is φ = 615494880.

The previous prime is 1231312211. The next prime is 1231312217. The reversal of 1231312216 is 6122131321.

It is a happy number.

It is a super-2 number, since 2×1231312216² = 3032259546541661312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231312211) 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, 16150 + ... + 52186.

It is an arithmetic number, because the mean of its divisors is an integer number (144332190).

Almost surely, 2^1231312216 is an apocalyptic number.

It is an amenable number.

1231312216 is a deficient number, since it is larger than the sum of its proper divisors (1078002824).

1231312216 is a wasteful number, since it uses less digits than its factorization.

1231312216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40314 (or 40310 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 1231312216 is about 35090.0586491388. The cubic root of 1231312216 is about 1071.8221538895.

Adding to 1231312216 its reverse (6122131321), we get a palindrome (7353443537).

The spelling of 1231312216 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred sixteen".