1265042143 has 2 divisors, whose sum is σ = 1265042144. Its totient is φ = 1265042142.

The previous prime is 1265042137. The next prime is 1265042153. The reversal of 1265042143 is 3412405621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265042143 - 2¹⁷ = 1264911071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265042153) 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, 632521071 + 632521072.

It is an arithmetic number, because the mean of its divisors is an integer number (632521072).

Almost surely, 2^1265042143 is an apocalyptic number.

1265042143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265042143 is an equidigital number, since it uses as much as digits as its factorization.

1265042143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1265042143 is about 35567.4309305578. The cubic root of 1265042143 is about 1081.5211028002.

Adding to 1265042143 its reverse (3412405621), we get a palindrome (4677447764).

The spelling of 1265042143 in words is "one billion, two hundred sixty-five million, forty-two thousand, one hundred forty-three".