205273145 has 16 divisors (see below), whose sum is σ = 307110528. Its totient is φ = 127962240.

The previous prime is 205273139. The next prime is 205273157. The reversal of 205273145 is 541372502.

It is a happy number.

It is not a de Polignac number, because 205273145 - 2¹² = 205269049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 266204 + ... + 266973.

It is an arithmetic number, because the mean of its divisors is an integer number (19194408).

Almost surely, 2^205273145 is an apocalyptic number.

It is an amenable number.

205273145 is a deficient number, since it is larger than the sum of its proper divisors (101837383).

205273145 is a wasteful number, since it uses less digits than its factorization.

205273145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533200.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 205273145 is about 14327.3565251933. The cubic root of 205273145 is about 589.8986180297.

The spelling of 205273145 in words is "two hundred five million, two hundred seventy-three thousand, one hundred forty-five".