205541145 has 40 divisors (see below), whose sum is σ = 387858240. Its totient is φ = 103848480.

The previous prime is 205541143. The next prime is 205541197. The reversal of 205541145 is 541145502.

205541145 is a `hidden beast` number, since 205 + 5 + 411 + 45 = 666.

It is not a de Polignac number, because 205541145 - 2¹ = 205541143 is a prime.

It is a super-2 number, since 2×205541145² = 84494324575822050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (205541143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5661 + ... + 21050.

It is an arithmetic number, because the mean of its divisors is an integer number (9696456).

Almost surely, 2^205541145 is an apocalyptic number.

It is an amenable number.

205541145 is a deficient number, since it is larger than the sum of its proper divisors (182317095).

205541145 is a wasteful number, since it uses less digits than its factorization.

205541145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26747 (or 26738 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 205541145 is about 14336.7062116792. The cubic root of 205541145 is about 590.1552258431.

Adding to 205541145 its reverse (541145502), we get a palindrome (746686647).

The spelling of 205541145 in words is "two hundred five million, five hundred forty-one thousand, one hundred forty-five".