991297920046 has 16 divisors (see below), whose sum is σ = 1699527578976. Its totient is φ = 424802036736.

The previous prime is 991297919959. The next prime is 991297920047. The reversal of 991297920046 is 640029792199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991297920047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3172891 + ... + 3471286.

It is an arithmetic number, because the mean of its divisors is an integer number (106220473686).

Almost surely, 2^991297920046 is an apocalyptic number.

991297920046 is a deficient number, since it is larger than the sum of its proper divisors (708229658930).

991297920046 is a wasteful number, since it uses less digits than its factorization.

991297920046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654843.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The spelling of 991297920046 in words is "nine hundred ninety-one billion, two hundred ninety-seven million, nine hundred twenty thousand, forty-six".