991325790001 has 8 divisors (see below), whose sum is σ = 1048907575520. Its totient is φ = 934284678912.

The previous prime is 991325789957. The next prime is 991325790031. The reversal of 991325790001 is 100097523199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991325790001 - 2¹⁷ = 991325658929 is a prime.

It is a super-2 number, since 2×991325790001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991325790031) 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, 135164835 + ... + 135172168.

It is an arithmetic number, because the mean of its divisors is an integer number (131113446940).

Almost surely, 2^991325790001 is an apocalyptic number.

It is an amenable number.

991325790001 is a deficient number, since it is larger than the sum of its proper divisors (57581785519).

991325790001 is a wasteful number, since it uses less digits than its factorization.

991325790001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270337215.

The product of its (nonzero) digits is 153090, while the sum is 46.

The spelling of 991325790001 in words is "nine hundred ninety-one billion, three hundred twenty-five million, seven hundred ninety thousand, one".