123029561 has 16 divisors (see below), whose sum is σ = 134265600. Its totient is φ = 112273920.

The previous prime is 123029549. The next prime is 123029611. The reversal of 123029561 is 165920321.

It is a cyclic number.

It is not a de Polignac number, because 123029561 - 2¹⁰ = 123028537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123029521) 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 15 ways as a sum of consecutive naturals, for example, 138260 + ... + 139146.

It is an arithmetic number, because the mean of its divisors is an integer number (8391600).

Almost surely, 2^123029561 is an apocalyptic number.

It is an amenable number.

123029561 is a deficient number, since it is larger than the sum of its proper divisors (11236039).

123029561 is a wasteful number, since it uses less digits than its factorization.

123029561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 123029561 is about 11091.8691391487. The cubic root of 123029561 is about 497.3588209119.

Adding to 123029561 its reverse (165920321), we get a palindrome (288949882).

The spelling of 123029561 in words is "one hundred twenty-three million, twenty-nine thousand, five hundred sixty-one".