1143911187 has 36 divisors (see below), whose sum is σ = 1777850760. Its totient is φ = 726873048.

The previous prime is 1143911183. The next prime is 1143911201. The reversal of 1143911187 is 7811193411.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 1143911187 - 2² = 1143911183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1143911183) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4041948 + ... + 4042230.

Almost surely, 2^1143911187 is an apocalyptic number.

1143911187 is a deficient number, since it is larger than the sum of its proper divisors (633939573).

1143911187 is an frugal number, since it uses more digits than its factorization.

1143911187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 309 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 1143911187 is about 33821.7561193975. The cubic root of 1143911187 is about 1045.8372408645.

The spelling of 1143911187 in words is "one billion, one hundred forty-three million, nine hundred eleven thousand, one hundred eighty-seven".