1213113331 has 4 divisors (see below), whose sum is σ = 1225619752. Its totient is φ = 1200606912.

The previous prime is 1213113329. The next prime is 1213113361. The reversal of 1213113331 is 1333113121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1333113121 = 33317 ⋅40013.

It is a cyclic number.

It is not a de Polignac number, because 1213113331 - 2¹ = 1213113329 is a prime.

It is a super-2 number, since 2×1213113331² = 2943287907699831122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213113299 and 1213113308.

It is not an unprimeable number, because it can be changed into a prime (1213113361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6253065 + ... + 6253258.

It is an arithmetic number, because the mean of its divisors is an integer number (306404938).

Almost surely, 2^1213113331 is an apocalyptic number.

1213113331 is a deficient number, since it is larger than the sum of its proper divisors (12506421).

1213113331 is an equidigital number, since it uses as much as digits as its factorization.

1213113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12506420.

The product of its digits is 162, while the sum is 19.

The square root of 1213113331 is about 34829.7764994265. The cubic root of 1213113331 is about 1066.5153858480.

Adding to 1213113331 its reverse (1333113121), we get a palindrome (2546226452).

The spelling of 1213113331 in words is "one billion, two hundred thirteen million, one hundred thirteen thousand, three hundred thirty-one".