1123525421 has 2 divisors, whose sum is σ = 1123525422. Its totient is φ = 1123525420.

The previous prime is 1123525397. The next prime is 1123525471. The reversal of 1123525421 is 1245253211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576480100 + 547045321 = 24010^2 + 23389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123525421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123525471) 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 as a sum of consecutive naturals, namely, 561762710 + 561762711.

It is an arithmetic number, because the mean of its divisors is an integer number (561762711).

Almost surely, 2^1123525421 is an apocalyptic number.

It is an amenable number.

1123525421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123525421 is an equidigital number, since it uses as much as digits as its factorization.

1123525421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 1123525421 is about 33519.0307288263. The cubic root of 1123525421 is about 1039.5873057454.

Adding to 1123525421 its reverse (1245253211), we get a palindrome (2368778632).

The spelling of 1123525421 in words is "one billion, one hundred twenty-three million, five hundred twenty-five thousand, four hundred twenty-one".