205122505 has 32 divisors (see below), whose sum is σ = 293529600. Its totient is φ = 134645760.

The previous prime is 205122469. The next prime is 205122553. The reversal of 205122505 is 505221502.

It is not a de Polignac number, because 205122505 - 2⁹ = 205121993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104271 + ... + 106219.

It is an arithmetic number, because the mean of its divisors is an integer number (9172800).

Almost surely, 2^205122505 is an apocalyptic number.

It is an amenable number.

205122505 is a deficient number, since it is larger than the sum of its proper divisors (88407095).

205122505 is a wasteful number, since it uses less digits than its factorization.

205122505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 205122505 is about 14322.0984845099. The cubic root of 205122505 is about 589.7542833938.

The spelling of 205122505 in words is "two hundred five million, one hundred twenty-two thousand, five hundred five".