123116561 has 8 divisors (see below), whose sum is σ = 129721920. Its totient is φ = 116523792.

The previous prime is 123116519. The next prime is 123116569. The reversal of 123116561 is 165611321.

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-123116561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123116561.

It is not an unprimeable number, because it can be changed into a prime (123116569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22271 + ... + 27243.

It is an arithmetic number, because the mean of its divisors is an integer number (16215240).

Almost surely, 2^123116561 is an apocalyptic number.

It is an amenable number.

123116561 is a deficient number, since it is larger than the sum of its proper divisors (6605359).

123116561 is a wasteful number, since it uses less digits than its factorization.

123116561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295.

The product of its digits is 1080, while the sum is 26.

The square root of 123116561 is about 11095.7902377433. The cubic root of 123116561 is about 497.4760285749.

Adding to 123116561 its reverse (165611321), we get a palindrome (288727882).

The spelling of 123116561 in words is "one hundred twenty-three million, one hundred sixteen thousand, five hundred sixty-one".