1213044655 has 32 divisors (see below), whose sum is σ = 1536288768. Its totient is φ = 918528000.

The previous prime is 1213044641. The next prime is 1213044659. The reversal of 1213044655 is 5564403121.

It is a happy number.

It is not a de Polignac number, because 1213044655 - 2⁷ = 1213044527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213044659) 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 31 ways as a sum of consecutive naturals, for example, 1053330 + ... + 1054480.

It is an arithmetic number, because the mean of its divisors is an integer number (48009024).

Almost surely, 2^1213044655 is an apocalyptic number.

1213044655 is a deficient number, since it is larger than the sum of its proper divisors (323244113).

1213044655 is a wasteful number, since it uses less digits than its factorization.

1213044655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1213044655 is about 34828.7906049004. The cubic root of 1213044655 is about 1066.4952598381.

Adding to 1213044655 its reverse (5564403121), we get a palindrome (6777447776).

The spelling of 1213044655 in words is "one billion, two hundred thirteen million, forty-four thousand, six hundred fifty-five".