205104155 has 8 divisors (see below), whose sum is σ = 246246912. Its totient is φ = 164002048.

The previous prime is 205104113. The next prime is 205104157. The reversal of 205104155 is 551401502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205104155 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205104155.

It is not an unprimeable number, because it can be changed into a prime (205104157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2342 + ... + 20388.

It is an arithmetic number, because the mean of its divisors is an integer number (30780864).

Almost surely, 2^205104155 is an apocalyptic number.

205104155 is a deficient number, since it is larger than the sum of its proper divisors (41142757).

205104155 is a wasteful number, since it uses less digits than its factorization.

205104155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20325.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 205104155 is about 14321.4578517691. The cubic root of 205104155 is about 589.7366966452.

Adding to 205104155 its reverse (551401502), we get a palindrome (756505657).

The spelling of 205104155 in words is "two hundred five million, one hundred four thousand, one hundred fifty-five".