123125661 has 12 divisors (see below), whose sum is σ = 178003488. Its totient is φ = 82012104.

The previous prime is 123125627. The next prime is 123125671. The reversal of 123125661 is 166521321.

It is not a de Polignac number, because 123125661 - 2⁷ = 123125533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123125671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6216 + ... + 16878.

It is an arithmetic number, because the mean of its divisors is an integer number (14833624).

Almost surely, 2^123125661 is an apocalyptic number.

It is an amenable number.

123125661 is a deficient number, since it is larger than the sum of its proper divisors (54877827).

123125661 is a wasteful number, since it uses less digits than its factorization.

123125661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11952 (or 11949 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 123125661 is about 11096.2002955967. The cubic root of 123125661 is about 497.4882850368.

Adding to 123125661 its reverse (166521321), we get a palindrome (289646982).

The spelling of 123125661 in words is "one hundred twenty-three million, one hundred twenty-five thousand, six hundred sixty-one".