199244901391 has 4 divisors (see below), whose sum is σ = 199249820784. Its totient is φ = 199239982000.

The previous prime is 199244901367. The next prime is 199244901413. The reversal of 199244901391 is 193109442991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199244901391 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 (199244901301) 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 3 ways as a sum of consecutive naturals, for example, 2398435 + ... + 2480116.

It is an arithmetic number, because the mean of its divisors is an integer number (49812455196).

Almost surely, 2^199244901391 is an apocalyptic number.

199244901391 is a deficient number, since it is larger than the sum of its proper divisors (4919393).

199244901391 is an equidigital number, since it uses as much as digits as its factorization.

199244901391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919392.

The product of its (nonzero) digits is 629856, while the sum is 52.

The spelling of 199244901391 in words is "one hundred ninety-nine billion, two hundred forty-four million, nine hundred one thousand, three hundred ninety-one".