1131213313 has 4 divisors (see below), whose sum is σ = 1150386480. Its totient is φ = 1112040148.

The previous prime is 1131213289. The next prime is 1131213331. The reversal of 1131213313 is 3133121311.

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: 3133121311 = 37799 ⋅82889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131213313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131213373) 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, 9586495 + ... + 9586612.

It is an arithmetic number, because the mean of its divisors is an integer number (287596620).

Almost surely, 2^1131213313 is an apocalyptic number.

It is an amenable number.

1131213313 is a deficient number, since it is larger than the sum of its proper divisors (19173167).

1131213313 is an equidigital number, since it uses as much as digits as its factorization.

1131213313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19173166.

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

The square root of 1131213313 is about 33633.5147286156. The cubic root of 1131213313 is about 1041.9530954310.

Adding to 1131213313 its reverse (3133121311), we get a palindrome (4264334624).

It can be divided in two parts, 11312133 and 13, that added together give a triangular number (11312146 = T₄₇₅₆).

The spelling of 1131213313 in words is "one billion, one hundred thirty-one million, two hundred thirteen thousand, three hundred thirteen".