635123 has 4 divisors (see below), whose sum is σ = 636720. Its totient is φ = 633528.

The previous prime is 635119. The next prime is 635147. The reversal of 635123 is 321536.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 635123 - 2² = 635119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 635095 and 635104.

It is not an unprimeable number, because it can be changed into a prime (635423) 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, 338 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (159180).

2⁶³⁵¹²³ is an apocalyptic number.

635123 is a deficient number, since it is larger than the sum of its proper divisors (1597).

635123 is an equidigital number, since it uses as much as digits as its factorization.

635123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596.

The product of its digits is 540, while the sum is 20.

The square root of 635123 is about 796.9460458525. The cubic root of 635123 is about 85.9579296663.

Adding to 635123 its reverse (321536), we get a palindrome (956659).

The spelling of 635123 in words is "six hundred thirty-five thousand, one hundred twenty-three".