991660846 has 16 divisors (see below), whose sum is σ = 1653337008. Its totient is φ = 442249600.

The previous prime is 991660811. The next prime is 991660853. The reversal of 991660846 is 648066199.

It is a pancake number, because a pancake can be divided into 991660846 parts by 44534 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 991660846.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 424075 + ... + 426406.

It is an arithmetic number, because the mean of its divisors is an integer number (103333563).

Almost surely, 2^991660846 is an apocalyptic number.

991660846 is a deficient number, since it is larger than the sum of its proper divisors (661676162).

991660846 is a wasteful number, since it uses less digits than its factorization.

991660846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850547.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 991660846 is about 31490.6469606453. The cubic root of 991660846 is about 997.2125191702.

The spelling of 991660846 in words is "nine hundred ninety-one million, six hundred sixty thousand, eight hundred forty-six".