1213455612 has 48 divisors (see below), whose sum is σ = 2872370592. Its totient is φ = 398668800.

The previous prime is 1213455611. The next prime is 1213455623. The reversal of 1213455612 is 2165543121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213455612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213455611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280248 + ... + 284544.

It is an arithmetic number, because the mean of its divisors is an integer number (59841054).

Almost surely, 2^1213455612 is an apocalyptic number.

1213455612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213455612 is an abundant number, since it is smaller than the sum of its proper divisors (1658914980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213455612 is a wasteful number, since it uses less digits than its factorization.

1213455612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4638 (or 4636 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1213455612 is about 34834.6897790120. The cubic root of 1213455612 is about 1066.6156825024.

Adding to 1213455612 its reverse (2165543121), we get a palindrome (3378998733).

The spelling of 1213455612 in words is "one billion, two hundred thirteen million, four hundred fifty-five thousand, six hundred twelve".