1123355557 has 8 divisors (see below), whose sum is σ = 1155173400. Its totient is φ = 1091614464.

The previous prime is 1123355543. The next prime is 1123355561. The reversal of 1123355557 is 7555533211.

It can be written as a sum of positive squares in 4 ways, for example, as 284731876 + 838623681 = 16874^2 + 28959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123355557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123355537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11169 + ... + 48697.

It is an arithmetic number, because the mean of its divisors is an integer number (144396675).

Almost surely, 2^1123355557 is an apocalyptic number.

It is an amenable number.

1123355557 is a deficient number, since it is larger than the sum of its proper divisors (31817843).

1123355557 is an equidigital number, since it uses as much as digits as its factorization.

1123355557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38375.

The product of its digits is 78750, while the sum is 37.

The square root of 1123355557 is about 33516.4967888949. The cubic root of 1123355557 is about 1039.5349119277.

Adding to 1123355557 its reverse (7555533211), we get a palindrome (8678888768).

The spelling of 1123355557 in words is "one billion, one hundred twenty-three million, three hundred fifty-five thousand, five hundred fifty-seven".