1171148985 has 24 divisors (see below), whose sum is σ = 2032041024. Its totient is φ = 623982240.

The previous prime is 1171148977. The next prime is 1171148987. The reversal of 1171148985 is 5898411711.

It is not a de Polignac number, because 1171148985 - 2³ = 1171148977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1171148985.

It is not an unprimeable number, because it can be changed into a prime (1171148987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33774 + ... + 59016.

It is an arithmetic number, because the mean of its divisors is an integer number (84668376).

Almost surely, 2^1171148985 is an apocalyptic number.

1171148985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1171148985 is a deficient number, since it is larger than the sum of its proper divisors (860892039).

1171148985 is a wasteful number, since it uses less digits than its factorization.

1171148985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26285 (or 26282 counting only the distinct ones).

The product of its digits is 80640, while the sum is 45.

The square root of 1171148985 is about 34222.0540733604. The cubic root of 1171148985 is about 1054.0730640660.

The spelling of 1171148985 in words is "one billion, one hundred seventy-one million, one hundred forty-eight thousand, nine hundred eighty-five".