1323156261 has 12 divisors (see below), whose sum is σ = 2052242592. Its totient is φ = 756089208.

The previous prime is 1323156253. The next prime is 1323156277. The reversal of 1323156261 is 1626513231.

It is not a de Polignac number, because 1323156261 - 2³ = 1323156253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323156061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4500385 + ... + 4500678.

It is an arithmetic number, because the mean of its divisors is an integer number (171020216).

Almost surely, 2^1323156261 is an apocalyptic number.

It is an amenable number.

1323156261 is a deficient number, since it is larger than the sum of its proper divisors (729086331).

1323156261 is an equidigital number, since it uses as much as digits as its factorization.

1323156261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001080 (or 9001073 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1323156261 is about 36375.2149272001. The cubic root of 1323156261 is about 1097.8349317717.

Adding to 1323156261 its reverse (1626513231), we get a palindrome (2949669492).

The spelling of 1323156261 in words is "one billion, three hundred twenty-three million, one hundred fifty-six thousand, two hundred sixty-one".