205434155 has 4 divisors (see below), whose sum is σ = 246520992. Its totient is φ = 164347320.

The previous prime is 205434143. The next prime is 205434167. The reversal of 205434155 is 551434502.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (205434143) and next prime (205434167).

It is not a de Polignac number, because 205434155 - 2¹⁰ = 205433131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20543411 + ... + 20543420.

It is an arithmetic number, because the mean of its divisors is an integer number (61630248).

Almost surely, 2^205434155 is an apocalyptic number.

205434155 is a deficient number, since it is larger than the sum of its proper divisors (41086837).

205434155 is an equidigital number, since it uses as much as digits as its factorization.

205434155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41086836.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 205434155 is about 14332.9743947305. The cubic root of 205434155 is about 590.0528105558.

Adding to 205434155 its reverse (551434502), we get a palindrome (756868657).

The spelling of 205434155 in words is "two hundred five million, four hundred thirty-four thousand, one hundred fifty-five".