191358427222909 has 4 divisors (see below), whose sum is σ = 192464545299516. Its totient is φ = 190252309146304.

The previous prime is 191358427222883. The next prime is 191358427222933. The reversal of 191358427222909 is 909222724853191.

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 158529503722500 + 32828923500409 = 12590850^2 + 5729653^2 .

It is a cyclic number.

It is not a de Polignac number, because 191358427222909 - 2⁵ = 191358427222877 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 (191358427222999) 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, 553059038044 + ... + 553059038389.

It is an arithmetic number, because the mean of its divisors is an integer number (48116136324879).

Almost surely, 2^{191358427222909} is an apocalyptic number.

It is an amenable number.

191358427222909 is a deficient number, since it is larger than the sum of its proper divisors (1106118076607).

191358427222909 is a wasteful number, since it uses less digits than its factorization.

191358427222909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106118076606.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 191358427222909 in words is "one hundred ninety-one trillion, three hundred fifty-eight billion, four hundred twenty-seven million, two hundred twenty-two thousand, nine hundred nine".