191797312 has 56 divisors (see below), whose sum is σ = 437245760. Its totient is φ = 81768960.

The previous prime is 191797297. The next prime is 191797339. The reversal of 191797312 is 213797191.

It is a tau number, because it is divible by the number of its divisors (56).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93514 + ... + 95542.

It is an arithmetic number, because the mean of its divisors is an integer number (7807960).

Almost surely, 2^191797312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191797312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218622880).

191797312 is an abundant number, since it is smaller than the sum of its proper divisors (245448448).

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

191797312 is a wasteful number, since it uses less digits than its factorization.

191797312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259 (or 2249 counting only the distinct ones).

The product of its digits is 23814, while the sum is 40.

The square root of 191797312 is about 13849.0906560684. The cubic root of 191797312 is about 576.6967520064.

The spelling of 191797312 in words is "one hundred ninety-one million, seven hundred ninety-seven thousand, three hundred twelve".