1231816612 has 48 divisors (see below), whose sum is σ = 2451818880. Its totient is φ = 537216768.

The previous prime is 1231816601. The next prime is 1231816613. The reversal of 1231816612 is 2166181321.

It is not an unprimeable number, because it can be changed into a prime (1231816613) 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 15 ways as a sum of consecutive naturals, for example, 93064 + ... + 105472.

It is an arithmetic number, because the mean of its divisors is an integer number (51079560).

Almost surely, 2^1231816612 is an apocalyptic number.

It is an amenable number.

1231816612 is a deficient number, since it is larger than the sum of its proper divisors (1220002268).

1231816612 is a wasteful number, since it uses less digits than its factorization.

1231816612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12532 (or 12530 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 1231816612 is about 35097.2450770712. The cubic root of 1231816612 is about 1071.9684880189.

Adding to 1231816612 its reverse (2166181321), we get a palindrome (3397997933).

The spelling of 1231816612 in words is "one billion, two hundred thirty-one million, eight hundred sixteen thousand, six hundred twelve".