1287798143 has 2 divisors, whose sum is σ = 1287798144. Its totient is φ = 1287798142.

The previous prime is 1287798119. The next prime is 1287798257. The reversal of 1287798143 is 3418977821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287798143 - 2⁶ = 1287798079 is a prime.

It is a super-2 number, since 2×1287798143² = 3316848114228496898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1287798091 and 1287798100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287791143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643899071 + 643899072.

It is an arithmetic number, because the mean of its divisors is an integer number (643899072).

Almost surely, 2^1287798143 is an apocalyptic number.

1287798143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287798143 is an equidigital number, since it uses as much as digits as its factorization.

1287798143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 1287798143 is about 35885.9045169548. The cubic root of 1287798143 is about 1087.9675232588.

The spelling of 1287798143 in words is "one billion, two hundred eighty-seven million, seven hundred ninety-eight thousand, one hundred forty-three".