1123925581 has 2 divisors, whose sum is σ = 1123925582. Its totient is φ = 1123925580.

The previous prime is 1123925513. The next prime is 1123925611. The reversal of 1123925581 is 1855293211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115894025 + 8031556 = 33405^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123925581 - 2¹⁵ = 1123892813 is a prime.

It is a super-2 number, since 2×1123925581² = 2526417423252375122, 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 1123925581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123925501) 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, 561962790 + 561962791.

It is an arithmetic number, because the mean of its divisors is an integer number (561962791).

Almost surely, 2^1123925581 is an apocalyptic number.

It is an amenable number.

1123925581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123925581 is an equidigital number, since it uses as much as digits as its factorization.

1123925581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 1123925581 is about 33524.9993437733. Note that the first 3 decimals coincide. The cubic root of 1123925581 is about 1039.7107125000.

The spelling of 1123925581 in words is "one billion, one hundred twenty-three million, nine hundred twenty-five thousand, five hundred eighty-one".