1142111187 has 48 divisors (see below), whose sum is σ = 2001093120. Its totient is φ = 612769536.

The previous prime is 1142111167. The next prime is 1142111209. The reversal of 1142111187 is 7811112411.

It is a happy number.

It is not a de Polignac number, because 1142111187 - 2¹⁰ = 1142110163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1142111187.

It is not an unprimeable number, because it can be changed into a prime (1142111107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 559114 + ... + 561152.

It is an arithmetic number, because the mean of its divisors is an integer number (41689440).

Almost surely, 2^1142111187 is an apocalyptic number.

1142111187 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1142111187 is a deficient number, since it is larger than the sum of its proper divisors (858981933).

1142111187 is a wasteful number, since it uses less digits than its factorization.

1142111187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592 (or 2589 counting only the distinct ones).

The product of its digits is 448, while the sum is 27.

The square root of 1142111187 is about 33795.1355523247. The cubic root of 1142111187 is about 1045.2883942627.

Adding to 1142111187 its reverse (7811112411), we get a palindrome (8953223598).

The spelling of 1142111187 in words is "one billion, one hundred forty-two million, one hundred eleven thousand, one hundred eighty-seven".