205143493 has 4 divisors (see below), whose sum is σ = 205377228. Its totient is φ = 204909760.

The previous prime is 205143473. The next prime is 205143517. The reversal of 205143493 is 394341502.

205143493 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394341502 = 2 ⋅197170751.

It can be written as a sum of positive squares in 2 ways, for example, as 136469124 + 68674369 = 11682^2 + 8287^2 .

It is a cyclic number.

It is not a de Polignac number, because 205143493 - 2¹⁷ = 205012421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205143473) 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, 115546 + ... + 117307.

It is an arithmetic number, because the mean of its divisors is an integer number (51344307).

Almost surely, 2^205143493 is an apocalyptic number.

It is an amenable number.

205143493 is a deficient number, since it is larger than the sum of its proper divisors (233735).

205143493 is an equidigital number, since it uses as much as digits as its factorization.

205143493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233734.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 205143493 is about 14322.8311796237. The cubic root of 205143493 is about 589.7743971315.

Adding to 205143493 its reverse (394341502), we get a palindrome (599484995).

The spelling of 205143493 in words is "two hundred five million, one hundred forty-three thousand, four hundred ninety-three".