205535123 has 4 divisors (see below), whose sum is σ = 207456120. Its totient is φ = 203614128.

The previous prime is 205535119. The next prime is 205535189. The reversal of 205535123 is 321535502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321535502 = 2 ⋅160767751.

It is a cyclic number.

It is not a de Polignac number, because 205535123 - 2² = 205535119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205535092 and 205535101.

It is not an unprimeable number, because it can be changed into a prime (205532123) 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, 960338 + ... + 960551.

It is an arithmetic number, because the mean of its divisors is an integer number (51864030).

Almost surely, 2^205535123 is an apocalyptic number.

205535123 is a deficient number, since it is larger than the sum of its proper divisors (1920997).

205535123 is a wasteful number, since it uses less digits than its factorization.

205535123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920996.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 205535123 is about 14336.4961897948. The cubic root of 205535123 is about 590.1494622778.

The spelling of 205535123 in words is "two hundred five million, five hundred thirty-five thousand, one hundred twenty-three".