1213345512 has 24 divisors (see below), whose sum is σ = 3286144290. Its totient is φ = 404448480.

The previous prime is 1213345499. The next prime is 1213345517. The reversal of 1213345512 is 2155433121.

1213345512 is a `hidden beast` number, since 12 + 133 + 4 + 5 + 512 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1211457636 + 1887876 = 34806^2 + 1374^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1213345517) 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 5 ways as a sum of consecutive naturals, for example, 8425939 + ... + 8426082.

Almost surely, 2^1213345512 is an apocalyptic number.

1213345512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213345512 is an abundant number, since it is smaller than the sum of its proper divisors (2072798778).

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

1213345512 is a wasteful number, since it uses less digits than its factorization.

1213345512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16852033 (or 16852026 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1213345512 is about 34833.1094219279. The cubic root of 1213345512 is about 1066.5834225836.

Adding to 1213345512 its reverse (2155433121), we get a palindrome (3368778633).

The spelling of 1213345512 in words is "one billion, two hundred thirteen million, three hundred forty-five thousand, five hundred twelve".