205245145 has 16 divisors (see below), whose sum is σ = 281795328. Its totient is φ = 140581440.

The previous prime is 205245133. The next prime is 205245191. The reversal of 205245145 is 541542502.

It is not a de Polignac number, because 205245145 - 2¹¹ = 205243097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34372 + ... + 39898.

It is an arithmetic number, because the mean of its divisors is an integer number (17612208).

Almost surely, 2^205245145 is an apocalyptic number.

It is an amenable number.

205245145 is a deficient number, since it is larger than the sum of its proper divisors (76550183).

205245145 is a wasteful number, since it uses less digits than its factorization.

205245145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6600.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 205245145 is about 14326.3793402241. The cubic root of 205245145 is about 589.8717953745.

Adding to 205245145 its reverse (541542502), we get a palindrome (746787647).

It can be divided in two parts, 205 and 245145, that added together give a triangular number (245350 = T₇₀₀).

The spelling of 205245145 in words is "two hundred five million, two hundred forty-five thousand, one hundred forty-five".