1123436561 has 8 divisors (see below), whose sum is σ = 1210733160. Its totient is φ = 1036265472.

The previous prime is 1123436557. The next prime is 1123436581. The reversal of 1123436561 is 1656343211.

It can be written as a sum of positive squares in 4 ways, for example, as 36481600 + 1086954961 = 6040^2 + 32969^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1123436561 - 2² = 1123436557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1123436581) 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, 12350 + ... + 48983.

It is an arithmetic number, because the mean of its divisors is an integer number (151341645).

Almost surely, 2^1123436561 is an apocalyptic number.

It is an amenable number.

1123436561 is a deficient number, since it is larger than the sum of its proper divisors (87296599).

1123436561 is a wasteful number, since it uses less digits than its factorization.

1123436561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62755.

The product of its digits is 12960, while the sum is 32.

The square root of 1123436561 is about 33517.7051869605. The cubic root of 1123436561 is about 1039.5598979207.

Adding to 1123436561 its reverse (1656343211), we get a palindrome (2779779772).

The spelling of 1123436561 in words is "one billion, one hundred twenty-three million, four hundred thirty-six thousand, five hundred sixty-one".