911991656 has 16 divisors (see below), whose sum is σ = 1810571940. Its totient is φ = 429172480.

The previous prime is 911991643. The next prime is 911991679. The reversal of 911991656 is 656199119.

It can be written as a sum of positive squares in 2 ways, for example, as 853224100 + 58767556 = 29210^2 + 7666^2 .

It is a super-2 number, since 2×911991656² = 1663457561227244672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 911991656.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3352775 + ... + 3353046.

Almost surely, 2^911991656 is an apocalyptic number.

It is an amenable number.

911991656 is a deficient number, since it is larger than the sum of its proper divisors (898580284).

911991656 is a wasteful number, since it uses less digits than its factorization.

911991656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705844 (or 6705840 counting only the distinct ones).

The product of its digits is 131220, while the sum is 47.

The square root of 911991656 is about 30199.1995920422. The cubic root of 911991656 is about 969.7585596699.

The spelling of 911991656 in words is "nine hundred eleven million, nine hundred ninety-one thousand, six hundred fifty-six".