991291002032 has 20 divisors (see below), whose sum is σ = 2004131809200. Its totient is φ = 474095696448.

The previous prime is 991291001977. The next prime is 991291002043. The reversal of 991291002032 is 230200192199.

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, 1346862407 + ... + 1346863142.

It is an arithmetic number, because the mean of its divisors is an integer number (100206590460).

Almost surely, 2^991291002032 is an apocalyptic number.

991291002032 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

991291002032 is an abundant number, since it is smaller than the sum of its proper divisors (1012840807168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991291002032 is a wasteful number, since it uses less digits than its factorization.

991291002032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693725580 (or 2693725574 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 991291002032 in words is "nine hundred ninety-one billion, two hundred ninety-one million, two thousand, thirty-two".