191890395193 has 16 divisors (see below), whose sum is σ = 220196104960. Its totient is φ = 163808433216.

The previous prime is 191890395143. The next prime is 191890395197. The reversal of 191890395193 is 391593098191.

It is a cyclic number.

It is not a de Polignac number, because 191890395193 - 2⁹ = 191890394681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191890395197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4424548 + ... + 4467706.

It is an arithmetic number, because the mean of its divisors is an integer number (13762256560).

Almost surely, 2^191890395193 is an apocalyptic number.

It is an amenable number.

191890395193 is a deficient number, since it is larger than the sum of its proper divisors (28305709767).

191890395193 is a wasteful number, since it uses less digits than its factorization.

191890395193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45736.

The product of its (nonzero) digits is 2361960, while the sum is 58.

The spelling of 191890395193 in words is "one hundred ninety-one billion, eight hundred ninety million, three hundred ninety-five thousand, one hundred ninety-three".