191171968 has 64 divisors (see below), whose sum is σ = 413748720. Its totient is φ = 87459840.

The previous prime is 191171963. The next prime is 191171993. The reversal of 191171968 is 869171191.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191171963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217546 + ... + 218422.

Almost surely, 2^191171968 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 191171968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206874360).

191171968 is an abundant number, since it is smaller than the sum of its proper divisors (222576752).

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

191171968 is a wasteful number, since it uses less digits than its factorization.

191171968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035 (or 1023 counting only the distinct ones).

The product of its digits is 27216, while the sum is 43.

The square root of 191171968 is about 13826.4951451914. The cubic root of 191171968 is about 576.0693075038.

The spelling of 191171968 in words is "one hundred ninety-one million, one hundred seventy-one thousand, nine hundred sixty-eight".