1123255521 has 12 divisors (see below), whose sum is σ = 1678428180. Its totient is φ = 723014880.

The previous prime is 1123255493. The next prime is 1123255537. The reversal of 1123255521 is 1255523211.

1123255521 is a `hidden beast` number, since 112 + 3 + 25 + 5 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 633075921 + 490179600 = 25161^2 + 22140^2 .

It is not a de Polignac number, because 1123255521 - 2⁹ = 1123255009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1123255541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2151570 + ... + 2152091.

It is an arithmetic number, because the mean of its divisors is an integer number (139869015).

Almost surely, 2^1123255521 is an apocalyptic number.

It is an amenable number.

1123255521 is a deficient number, since it is larger than the sum of its proper divisors (555172659).

1123255521 is a wasteful number, since it uses less digits than its factorization.

1123255521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303696 (or 4303693 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1123255521 is about 33515.0044159329. The cubic root of 1123255521 is about 1039.5040537841.

Adding to 1123255521 its reverse (1255523211), we get a palindrome (2378778732).

The spelling of 1123255521 in words is "one billion, one hundred twenty-three million, two hundred fifty-five thousand, five hundred twenty-one".