1156213313 has 4 divisors (see below), whose sum is σ = 1158183600. Its totient is φ = 1154243028.

The previous prime is 1156213273. The next prime is 1156213319. The reversal of 1156213313 is 3133126511.

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: 3133126511 = 2341 ⋅1338371.

It is a cyclic number.

It is not a de Polignac number, because 1156213313 - 2¹² = 1156209217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156213319) 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, 984263 + ... + 985436.

It is an arithmetic number, because the mean of its divisors is an integer number (289545900).

Almost surely, 2^1156213313 is an apocalyptic number.

It is an amenable number.

1156213313 is a deficient number, since it is larger than the sum of its proper divisors (1970287).

1156213313 is an equidigital number, since it uses as much as digits as its factorization.

1156213313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970286.

The product of its digits is 1620, while the sum is 26.

The square root of 1156213313 is about 34003.1368111826. The cubic root of 1156213313 is about 1049.5730124792.

Adding to 1156213313 its reverse (3133126511), we get a palindrome (4289339824).

The spelling of 1156213313 in words is "one billion, one hundred fifty-six million, two hundred thirteen thousand, three hundred thirteen".