1143201987 has 12 divisors (see below), whose sum is σ = 1695921760. Its totient is φ = 741536208.

The previous prime is 1143201979. The next prime is 1143202003. The reversal of 1143201987 is 7891023411.

It is a happy number.

It is not a de Polignac number, because 1143201987 - 2³ = 1143201979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143201947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1716187 + ... + 1716852.

Almost surely, 2^1143201987 is an apocalyptic number.

1143201987 is a deficient number, since it is larger than the sum of its proper divisors (552719773).

1143201987 is a wasteful number, since it uses less digits than its factorization.

1143201987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433082 (or 3433079 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1143201987 is about 33811.2701181130. The cubic root of 1143201987 is about 1045.6210640863.

The spelling of 1143201987 in words is "one billion, one hundred forty-three million, two hundred one thousand, nine hundred eighty-seven".