1213533044 has 36 divisors (see below), whose sum is σ = 2193194304. Its totient is φ = 587247408.

The previous prime is 1213533023. The next prime is 1213533071. The reversal of 1213533044 is 4403353121.

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 11 ways as a sum of consecutive naturals, for example, 6098057 + ... + 6098255.

It is an arithmetic number, because the mean of its divisors is an integer number (60922064).

Almost surely, 2^1213533044 is an apocalyptic number.

It is an amenable number.

1213533044 is a deficient number, since it is larger than the sum of its proper divisors (979661260).

1213533044 is a wasteful number, since it uses less digits than its factorization.

1213533044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1213533044 is about 34835.8011821172. The cubic root of 1213533044 is about 1066.6383693448.

Adding to 1213533044 its reverse (4403353121), we get a palindrome (5616886165).

The spelling of 1213533044 in words is "one billion, two hundred thirteen million, five hundred thirty-three thousand, forty-four".