199791120401 has 4 divisors (see below), whose sum is σ = 200473001652. Its totient is φ = 199109239152.

The previous prime is 199791120371. The next prime is 199791120421. The reversal of 199791120401 is 104021197991.

It is a Cunningham number, because it is equal to 446980²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189030170176 + 10760950225 = 434776^2 + 103735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199791120401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199791120421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340940186 + ... + 340940771.

It is an arithmetic number, because the mean of its divisors is an integer number (50118250413).

Almost surely, 2^199791120401 is an apocalyptic number.

It is an amenable number.

199791120401 is a deficient number, since it is larger than the sum of its proper divisors (681881251).

199791120401 is an equidigital number, since it uses as much as digits as its factorization.

199791120401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681881250.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 199791120401 in words is "one hundred ninety-nine billion, seven hundred ninety-one million, one hundred twenty thousand, four hundred one".