191911001011 has 4 divisors (see below), whose sum is σ = 191925671632. Its totient is φ = 191896330392.

The previous prime is 191911000973. The next prime is 191911001017. The reversal of 191911001011 is 110100119191.

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 191911001011 - 2⁹ = 191911000499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191911001017) 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, 7315671 + ... + 7341856.

It is an arithmetic number, because the mean of its divisors is an integer number (47981417908).

Almost surely, 2^191911001011 is an apocalyptic number.

191911001011 is a deficient number, since it is larger than the sum of its proper divisors (14670621).

191911001011 is a wasteful number, since it uses less digits than its factorization.

191911001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14670620.

The product of its (nonzero) digits is 81, while the sum is 25.

The spelling of 191911001011 in words is "one hundred ninety-one billion, nine hundred eleven million, one thousand, eleven".