194904727409491 has 4 divisors (see below), whose sum is σ = 212623338992184. Its totient is φ = 177186115826800.

The previous prime is 194904727409443. The next prime is 194904727409507.

194904727409491 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 194904727409491 - 2³¹ = 194902579925843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194904727409491.

It is not an unprimeable number, because it can be changed into a prime (194904727449491) 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, 8859305791330 + ... + 8859305791351.

It is an arithmetic number, because the mean of its divisors is an integer number (53155834748046).

Almost surely, 2^{194904727409491} is an apocalyptic number.

194904727409491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194904727409491 is a deficient number, since it is larger than the sum of its proper divisors (17718611582693).

194904727409491 is a wasteful number, since it uses less digits than its factorization.

194904727409491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17718611582692.

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 194904727409491 in words is "one hundred ninety-four trillion, nine hundred four billion, seven hundred twenty-seven million, four hundred nine thousand, four hundred ninety-one".