1123315261 has 4 divisors (see below), whose sum is σ = 1162050300. Its totient is φ = 1084580224.

The previous prime is 1123315247. The next prime is 1123315267. The reversal of 1123315261 is 1625133211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 788205625 + 335109636 = 28075^2 + 18306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123315261 - 2⁵ = 1123315229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123315267) 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 3 ways as a sum of consecutive naturals, for example, 19367476 + ... + 19367533.

It is an arithmetic number, because the mean of its divisors is an integer number (290512575).

Almost surely, 2^1123315261 is an apocalyptic number.

It is an amenable number.

1123315261 is a deficient number, since it is larger than the sum of its proper divisors (38735039).

1123315261 is an equidigital number, since it uses as much as digits as its factorization.

1123315261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38735038.

The product of its digits is 1080, while the sum is 25.

The square root of 1123315261 is about 33515.8956466928. The cubic root of 1123315261 is about 1039.5224820253.

Adding to 1123315261 its reverse (1625133211), we get a palindrome (2748448472).

The spelling of 1123315261 in words is "one billion, one hundred twenty-three million, three hundred fifteen thousand, two hundred sixty-one".