1123252181 has 2 divisors, whose sum is σ = 1123252182. Its totient is φ = 1123252180.

The previous prime is 1123252147. The next prime is 1123252289. The reversal of 1123252181 is 1812523211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098591025 + 24661156 = 33145^2 + 4966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123252181 is a prime.

It is a super-2 number, since 2×1123252181² = 2523390924242513522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1123252181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123252111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561626090 + 561626091.

It is an arithmetic number, because the mean of its divisors is an integer number (561626091).

Almost surely, 2^1123252181 is an apocalyptic number.

It is an amenable number.

1123252181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123252181 is an equidigital number, since it uses as much as digits as its factorization.

1123252181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 26.

The square root of 1123252181 is about 33514.9545874674. The cubic root of 1123252181 is about 1039.5030234614.

Adding to 1123252181 its reverse (1812523211), we get a palindrome (2935775392).

The spelling of 1123252181 in words is "one billion, one hundred twenty-three million, two hundred fifty-two thousand, one hundred eighty-one".