1991874931201 has 8 divisors (see below), whose sum is σ = 2016346881024. Its totient is φ = 1967414254320.

The previous prime is 1991874931199. The next prime is 1991874931259. The reversal of 1991874931201 is 1021394781991.

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 1991874931201 - 2¹ = 1991874931199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1991874931801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462401 + ... + 3169726.

It is an arithmetic number, because the mean of its divisors is an integer number (252043360128).

Almost surely, 2^{1991874931201} is an apocalyptic number.

It is an amenable number.

1991874931201 is a deficient number, since it is larger than the sum of its proper divisors (24471949823).

1991874931201 is an equidigital number, since it uses as much as digits as its factorization.

1991874931201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5636471.

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 1991874931201 in words is "one trillion, nine hundred ninety-one billion, eight hundred seventy-four million, nine hundred thirty-one thousand, two hundred one".