205142143 has 4 divisors (see below), whose sum is σ = 212216040. Its totient is φ = 198068248.

The previous prime is 205142137. The next prime is 205142149. The reversal of 205142143 is 341241502.

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

It is an interprime number because it is at equal distance from previous prime (205142137) and next prime (205142149).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205142143 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205142149) 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, 3536905 + ... + 3536962.

It is an arithmetic number, because the mean of its divisors is an integer number (53054010).

Almost surely, 2^205142143 is an apocalyptic number.

205142143 is a deficient number, since it is larger than the sum of its proper divisors (7073897).

205142143 is an equidigital number, since it uses as much as digits as its factorization.

205142143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073896.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 205142143 is about 14322.7840519921. The cubic root of 205142143 is about 589.7731034075.

Adding to 205142143 its reverse (341241502), we get a palindrome (546383645).

The spelling of 205142143 in words is "two hundred five million, one hundred forty-two thousand, one hundred forty-three".