123165601 has 4 divisors (see below), whose sum is σ = 132639892. Its totient is φ = 113691312.

The previous prime is 123165547. The next prime is 123165643. The reversal of 123165601 is 106561321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106561321 = 17 ⋅6268313.

It can be written as a sum of positive squares in 2 ways, for example, as 11229201 + 111936400 = 3351^2 + 10580^2 .

It is a cyclic number.

It is not a de Polignac number, because 123165601 - 2⁷ = 123165473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123165671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4737126 + ... + 4737151.

It is an arithmetic number, because the mean of its divisors is an integer number (33159973).

Almost surely, 2^123165601 is an apocalyptic number.

It is an amenable number.

123165601 is a deficient number, since it is larger than the sum of its proper divisors (9474291).

123165601 is an equidigital number, since it uses as much as digits as its factorization.

123165601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474290.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 123165601 is about 11097.9998648405. Note that the first 3 decimals coincide. The cubic root of 123165601 is about 497.5420716422.

It can be divided in two parts, 12 and 3165601, that added together give a palindrome (3165613).

The spelling of 123165601 in words is "one hundred twenty-three million, one hundred sixty-five thousand, six hundred one".