123611 has 4 divisors (see below), whose sum is σ = 125424. Its totient is φ = 121800.

The previous prime is 123601. The next prime is 123619. The reversal of 123611 is 116321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116321 = 293 ⋅397.

It is a cyclic number.

It is not a de Polignac number, because 123611 - 2⁶ = 123547 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 123611.

It is not an unprimeable number, because it can be changed into a prime (123619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (31356).

2¹²³⁶¹¹ is an apocalyptic number.

123611 is a deficient number, since it is larger than the sum of its proper divisors (1813).

123611 is an equidigital number, since it uses as much as digits as its factorization.

123611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812.

The product of its digits is 36, while the sum is 14.

The square root of 123611 is about 351.5835604803. The cubic root of 123611 is about 49.8141097528.

Adding to 123611 its reverse (116321), we get a palindrome (239932).

The spelling of 123611 in words is "one hundred twenty-three thousand, six hundred eleven".