1171791808 has 56 divisors (see below), whose sum is σ = 2598596784. Its totient is φ = 519628800.

The previous prime is 1171791779. The next prime is 1171791851. The reversal of 1171791808 is 8081971711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8566 + ... + 49162.

It is an arithmetic number, because the mean of its divisors is an integer number (46403514).

Almost surely, 2^1171791808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1171791808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299298392).

1171791808 is an abundant number, since it is smaller than the sum of its proper divisors (1426804976).

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

1171791808 is a wasteful number, since it uses less digits than its factorization.

1171791808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40661 (or 40651 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 43.

The square root of 1171791808 is about 34231.4447255736. Note that the first 3 decimals coincide. The cubic root of 1171791808 is about 1054.2658828234.

The spelling of 1171791808 in words is "one billion, one hundred seventy-one million, seven hundred ninety-one thousand, eight hundred eight".