991497310332 has 96 divisors (see below), whose sum is σ = 2481746480640. Its totient is φ = 306991472640.

The previous prime is 991497310327. The next prime is 991497310351. The reversal of 991497310332 is 233013794199.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7034107 + ... + 7173677.

It is an arithmetic number, because the mean of its divisors is an integer number (25851525840).

Almost surely, 2^991497310332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991497310332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1240873240320).

991497310332 is an abundant number, since it is smaller than the sum of its proper divisors (1490249170308).

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

991497310332 is a wasteful number, since it uses less digits than its factorization.

991497310332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140051 (or 140049 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 51.

The spelling of 991497310332 in words is "nine hundred ninety-one billion, four hundred ninety-seven million, three hundred ten thousand, three hundred thirty-two".