1152156221 has 2 divisors, whose sum is σ = 1152156222. Its totient is φ = 1152156220.

The previous prime is 1152156217. The next prime is 1152156301. The reversal of 1152156221 is 1226512511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1088076196 + 64080025 = 32986^2 + 8005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1152156221 - 2² = 1152156217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1152156721) 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 as a sum of consecutive naturals, namely, 576078110 + 576078111.

It is an arithmetic number, because the mean of its divisors is an integer number (576078111).

Almost surely, 2^1152156221 is an apocalyptic number.

It is an amenable number.

1152156221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1152156221 is an equidigital number, since it uses as much as digits as its factorization.

1152156221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 26.

The square root of 1152156221 is about 33943.4267716151. The cubic root of 1152156221 is about 1048.3439415187.

Adding to 1152156221 its reverse (1226512511), we get a palindrome (2378668732).

The spelling of 1152156221 in words is "one billion, one hundred fifty-two million, one hundred fifty-six thousand, two hundred twenty-one".