1123206557 has 16 divisors (see below), whose sum is σ = 1243045440. Its totient is φ = 1006416000.

The previous prime is 1123206503. The next prime is 1123206571. The reversal of 1123206557 is 7556023211.

It is a cyclic number.

It is not a de Polignac number, because 1123206557 - 2⁶ = 1123206493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123206577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256694 + ... + 261032.

It is an arithmetic number, because the mean of its divisors is an integer number (77690340).

Almost surely, 2^1123206557 is an apocalyptic number.

It is an amenable number.

1123206557 is a deficient number, since it is larger than the sum of its proper divisors (119838883).

1123206557 is a wasteful number, since it uses less digits than its factorization.

1123206557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1123206557 is about 33514.2739291783. The cubic root of 1123206557 is about 1039.4889491722.

Adding to 1123206557 its reverse (7556023211), we get a palindrome (8679229768).

The spelling of 1123206557 in words is "one billion, one hundred twenty-three million, two hundred six thousand, five hundred fifty-seven".