1171220913 has 24 divisors (see below), whose sum is σ = 1702838592. Its totient is φ = 775722528.

The previous prime is 1171220879. The next prime is 1171220959. The reversal of 1171220913 is 3190221711.

It is not a de Polignac number, because 1171220913 - 2⁶ = 1171220849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1171230913) 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 23 ways as a sum of consecutive naturals, for example, 1325970 + ... + 1326852.

It is an arithmetic number, because the mean of its divisors is an integer number (70951608).

Almost surely, 2^1171220913 is an apocalyptic number.

It is an amenable number.

1171220913 is a deficient number, since it is larger than the sum of its proper divisors (531617679).

1171220913 is a wasteful number, since it uses less digits than its factorization.

1171220913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685 (or 1682 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 1171220913 is about 34223.1049584926. The cubic root of 1171220913 is about 1054.0946428222.

The spelling of 1171220913 in words is "one billion, one hundred seventy-one million, two hundred twenty thousand, nine hundred thirteen".