1213533112 has 32 divisors (see below), whose sum is σ = 2483579520. Its totient is φ = 551305440.

The previous prime is 1213533109. The next prime is 1213533121. The reversal of 1213533112 is 2113353121.

It is a super-2 number, since 2×1213533112² = 2945325227840809088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 in 7 ways as a sum of consecutive naturals, for example, 278293 + ... + 282619.

It is an arithmetic number, because the mean of its divisors is an integer number (77611860).

Almost surely, 2^1213533112 is an apocalyptic number.

It is an amenable number.

1213533112 is an abundant number, since it is smaller than the sum of its proper divisors (1270046408).

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

1213533112 is a wasteful number, since it uses less digits than its factorization.

1213533112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531 (or 7527 counting only the distinct ones).

The product of its digits is 540, while the sum is 22.

The square root of 1213533112 is about 34835.8021581246. The cubic root of 1213533112 is about 1066.6383892677.

Adding to 1213533112 its reverse (2113353121), we get a palindrome (3326886233).

Subtracting 1213533112 from its reverse (2113353121), we obtain a square (899820009 = 29997²).

The spelling of 1213533112 in words is "one billion, two hundred thirteen million, five hundred thirty-three thousand, one hundred twelve".