1143071987 has 2 divisors, whose sum is σ = 1143071988. Its totient is φ = 1143071986.

The previous prime is 1143071981. The next prime is 1143072011. The reversal of 1143071987 is 7891703411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1143071987 - 2¹⁰ = 1143070963 is a prime.

It is a super-2 number, since 2×1143071987² = 2613227134928256338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1143071981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571535993 + 571535994.

It is an arithmetic number, because the mean of its divisors is an integer number (571535994).

Almost surely, 2^1143071987 is an apocalyptic number.

1143071987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143071987 is an equidigital number, since it uses as much as digits as its factorization.

1143071987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 1143071987 is about 33809.3476275423. The cubic root of 1143071987 is about 1045.5814280777.

The spelling of 1143071987 in words is "one billion, one hundred forty-three million, seventy-one thousand, nine hundred eighty-seven".