1171278906 has 64 divisors (see below), whose sum is σ = 2766514176. Its totient is φ = 323668800.

The previous prime is 1171278881. The next prime is 1171278923. The reversal of 1171278906 is 6098721711.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154341 + ... + 161751.

It is an arithmetic number, because the mean of its divisors is an integer number (43226784).

Almost surely, 2^1171278906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1171278906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383257088).

1171278906 is an abundant number, since it is smaller than the sum of its proper divisors (1595235270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1171278906 is a wasteful number, since it uses less digits than its factorization.

1171278906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7547.

The product of its (nonzero) digits is 42336, while the sum is 42.

The square root of 1171278906 is about 34223.9522264744. The cubic root of 1171278906 is about 1054.1120403660.

The spelling of 1171278906 in words is "one billion, one hundred seventy-one million, two hundred seventy-eight thousand, nine hundred six".