1212444113 has 4 divisors (see below), whose sum is σ = 1232320308. Its totient is φ = 1192567920.

The previous prime is 1212444091. The next prime is 1212444139. The reversal of 1212444113 is 3114442121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107081104 + 1105363009 = 10348^2 + 33247^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212444113 - 2⁶ = 1212444049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212444143) 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 3 ways as a sum of consecutive naturals, for example, 9938006 + ... + 9938127.

It is an arithmetic number, because the mean of its divisors is an integer number (308080077).

Almost surely, 2^1212444113 is an apocalyptic number.

It is an amenable number.

1212444113 is a deficient number, since it is larger than the sum of its proper divisors (19876195).

1212444113 is an equidigital number, since it uses as much as digits as its factorization.

1212444113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19876194.

The product of its digits is 768, while the sum is 23.

The square root of 1212444113 is about 34820.1681931607. The cubic root of 1212444113 is about 1066.3192341889.

Adding to 1212444113 its reverse (3114442121), we get a palindrome (4326886234).

The spelling of 1212444113 in words is "one billion, two hundred twelve million, four hundred forty-four thousand, one hundred thirteen".