1168587981 has 36 divisors (see below), whose sum is σ = 1860584544. Its totient is φ = 700935600.

The previous prime is 1168587977. The next prime is 1168587991. The reversal of 1168587981 is 1897858611.

It is a happy number.

It is not a de Polignac number, because 1168587981 - 2² = 1168587977 is a prime.

It is a super-2 number, since 2×1168587981² = 2731195738675312722, which contains 22 as substring.

Its product of digits (967680) is a multiple of the sum of its prime divisors (1152).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1168587911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1132936 + ... + 1133966.

It is an arithmetic number, because the mean of its divisors is an integer number (51682904).

Almost surely, 2^1168587981 is an apocalyptic number.

1168587981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1168587981 is a deficient number, since it is larger than the sum of its proper divisors (691996563).

1168587981 is a wasteful number, since it uses less digits than its factorization.

1168587981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262 (or 1152 counting only the distinct ones).

The product of its digits is 967680, while the sum is 54.

The square root of 1168587981 is about 34184.6161452780. The cubic root of 1168587981 is about 1053.3041737263.

The spelling of 1168587981 in words is "one billion, one hundred sixty-eight million, five hundred eighty-seven thousand, nine hundred eighty-one".