1213311113 has 4 divisors (see below), whose sum is σ = 1386641280. Its totient is φ = 1039980948.

The previous prime is 1213311103. The next prime is 1213311149. The reversal of 1213311113 is 3111133121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3111133121 = 4211 ⋅738811.

It is a cyclic number.

It is not a de Polignac number, because 1213311113 - 2²⁶ = 1146202249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213311091 and 1213311100.

It is not an unprimeable number, because it can be changed into a prime (1213311103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86665073 + ... + 86665086.

It is an arithmetic number, because the mean of its divisors is an integer number (346660320).

Almost surely, 2^1213311113 is an apocalyptic number.

It is an amenable number.

1213311113 is a deficient number, since it is larger than the sum of its proper divisors (173330167).

1213311113 is an equidigital number, since it uses as much as digits as its factorization.

1213311113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173330166.

The product of its digits is 54, while the sum is 17.

The square root of 1213311113 is about 34832.6156497039. The cubic root of 1213311113 is about 1066.5733430831.

Adding to 1213311113 its reverse (3111133121), we get a palindrome (4324444234).

The spelling of 1213311113 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, one hundred thirteen".