191268931933 has 4 divisors (see below), whose sum is σ = 191269993180. Its totient is φ = 191267870688.

The previous prime is 191268931927. The next prime is 191268931939. The reversal of 191268931933 is 339139862191.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 339139862191 = 13 ⋅26087681707.

It is an interprime number because it is at equal distance from previous prime (191268931927) and next prime (191268931939).

It can be written as a sum of positive squares in 2 ways, for example, as 55393388164 + 135875543769 = 235358^2 + 368613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191268931933 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 (191268931939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185418 + ... + 645691.

It is an arithmetic number, because the mean of its divisors is an integer number (47817498295).

Almost surely, 2^191268931933 is an apocalyptic number.

It is an amenable number.

191268931933 is a deficient number, since it is larger than the sum of its proper divisors (1061247).

191268931933 is an equidigital number, since it uses as much as digits as its factorization.

191268931933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061246.

The product of its digits is 1889568, while the sum is 55.

The spelling of 191268931933 in words is "one hundred ninety-one billion, two hundred sixty-eight million, nine hundred thirty-one thousand, nine hundred thirty-three".