1205012143 has 2 divisors, whose sum is σ = 1205012144. Its totient is φ = 1205012142.

The previous prime is 1205012111. The next prime is 1205012197. The reversal of 1205012143 is 3412105021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1205012143 - 2⁵ = 1205012111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1205012143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205010143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602506071 + 602506072.

It is an arithmetic number, because the mean of its divisors is an integer number (602506072).

Almost surely, 2^1205012143 is an apocalyptic number.

1205012143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205012143 is an equidigital number, since it uses as much as digits as its factorization.

1205012143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1205012143 is about 34713.2848200800. The cubic root of 1205012143 is about 1064.1360131846.

Adding to 1205012143 its reverse (3412105021), we get a palindrome (4617117164).

The spelling of 1205012143 in words is "one billion, two hundred five million, twelve thousand, one hundred forty-three".