191319267228 has 12 divisors (see below), whose sum is σ = 446411623560. Its totient is φ = 63773089072.

The previous prime is 191319267211. The next prime is 191319267239. The reversal of 191319267228 is 822762913191.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7971636123 + ... + 7971636146.

It is an arithmetic number, because the mean of its divisors is an integer number (37200968630).

Almost surely, 2^191319267228 is an apocalyptic number.

It is an amenable number.

191319267228 is an abundant number, since it is smaller than the sum of its proper divisors (255092356332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191319267228 is a wasteful number, since it uses less digits than its factorization.

191319267228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15943272276 (or 15943272274 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The spelling of 191319267228 in words is "one hundred ninety-one billion, three hundred nineteen million, two hundred sixty-seven thousand, two hundred twenty-eight".