1992801900991 has 16 divisors (see below), whose sum is σ = 2197706766336. Its totient is φ = 1791890100000.

The previous prime is 1992801900967. The next prime is 1992801901007. The reversal of 1992801900991 is 1990091082991.

It is not a de Polignac number, because 1992801900991 - 2⁷ = 1992801900863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992801900391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196006 + ... + 2005996.

It is an arithmetic number, because the mean of its divisors is an integer number (137356672896).

Almost surely, 2^{1992801900991} is an apocalyptic number.

1992801900991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1992801900991 is a deficient number, since it is larger than the sum of its proper divisors (204904865345).

1992801900991 is a wasteful number, since it uses less digits than its factorization.

1992801900991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811094.

The product of its (nonzero) digits is 944784, while the sum is 58.

The spelling of 1992801900991 in words is "one trillion, nine hundred ninety-two billion, eight hundred one million, nine hundred thousand, nine hundred ninety-one".