991487671364 has 12 divisors (see below), whose sum is σ = 1735123370988. Its totient is φ = 495738136800.

The previous prime is 991487671301. The next prime is 991487671379. The reversal of 991487671364 is 463176784199.

It can be written as a sum of positive squares in 2 ways, for example, as 135107704900 + 856379966464 = 367570^2 + 925408^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 991487671364.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020527 + ... + 1739094.

It is an arithmetic number, because the mean of its divisors is an integer number (144593614249).

Almost surely, 2^991487671364 is an apocalyptic number.

It is an amenable number.

991487671364 is a deficient number, since it is larger than the sum of its proper divisors (743635699624).

991487671364 is a wasteful number, since it uses less digits than its factorization.

991487671364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849446 (or 2849444 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 65.

The spelling of 991487671364 in words is "nine hundred ninety-one billion, four hundred eighty-seven million, six hundred seventy-one thousand, three hundred sixty-four".