205485771 has 4 divisors (see below), whose sum is σ = 273981032. Its totient is φ = 136990512.

The previous prime is 205485757. The next prime is 205485811. The reversal of 205485771 is 177584502.

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

It is not a de Polignac number, because 205485771 - 2¹¹ = 205483723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205485671) 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, 34247626 + ... + 34247631.

It is an arithmetic number, because the mean of its divisors is an integer number (68495258).

Almost surely, 2^205485771 is an apocalyptic number.

205485771 is a deficient number, since it is larger than the sum of its proper divisors (68495261).

205485771 is an equidigital number, since it uses as much as digits as its factorization.

205485771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68495260.

The product of its (nonzero) digits is 78400, while the sum is 39.

The square root of 205485771 is about 14334.7748848735. The cubic root of 205485771 is about 590.1022239805.

The spelling of 205485771 in words is "two hundred five million, four hundred eighty-five thousand, seven hundred seventy-one".