1156213361 has 2 divisors, whose sum is σ = 1156213362. Its totient is φ = 1156213360.

The previous prime is 1156213349. The next prime is 1156213363. The reversal of 1156213361 is 1633126511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687750625 + 468462736 = 26225^2 + 21644^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156213361 - 2¹⁸ = 1155951217 is a prime.

Together with 1156213363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1156213363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578106680 + 578106681.

It is an arithmetic number, because the mean of its divisors is an integer number (578106681).

Almost surely, 2^1156213361 is an apocalyptic number.

It is an amenable number.

1156213361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156213361 is an equidigital number, since it uses as much as digits as its factorization.

1156213361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 1156213361 is about 34003.1375169998. The cubic root of 1156213361 is about 1049.5730270035.

Adding to 1156213361 its reverse (1633126511), we get a palindrome (2789339872).

The spelling of 1156213361 in words is "one billion, one hundred fifty-six million, two hundred thirteen thousand, three hundred sixty-one".