123175561 has 2 divisors, whose sum is σ = 123175562. Its totient is φ = 123175560.

The previous prime is 123175543. The next prime is 123175567. The reversal of 123175561 is 165571321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 58614336 = 8035^2 + 7656^2 .

It is an emirp because it is prime and its reverse (165571321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123175561 - 2⁷ = 123175433 is a prime.

It is not a weakly prime, because it can be changed into another prime (123175567) 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 as a sum of consecutive naturals, namely, 61587780 + 61587781.

It is an arithmetic number, because the mean of its divisors is an integer number (61587781).

Almost surely, 2^123175561 is an apocalyptic number.

It is an amenable number.

123175561 is a deficient number, since it is larger than the sum of its proper divisors (1).

123175561 is an equidigital number, since it uses as much as digits as its factorization.

123175561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 31.

The square root of 123175561 is about 11098.4485852753. The cubic root of 123175561 is about 497.5554828149. Note that the first 3 decimals are identical.

The spelling of 123175561 in words is "one hundred twenty-three million, one hundred seventy-five thousand, five hundred sixty-one".