191981718192 has 160 divisors (see below), whose sum is σ = 560284853760. Its totient is φ = 56111104000.

The previous prime is 191981718161. The next prime is 191981718211. The reversal of 191981718192 is 291817189191.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15780592 + ... + 15792752.

It is an arithmetic number, because the mean of its divisors is an integer number (3501780336).

Almost surely, 2^191981718192 is an apocalyptic number.

191981718192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191981718192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280142426880).

191981718192 is an abundant number, since it is smaller than the sum of its proper divisors (368303135568).

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

191981718192 is a wasteful number, since it uses less digits than its factorization.

191981718192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243 (or 13237 counting only the distinct ones).

The product of its digits is 653184, while the sum is 57.

The spelling of 191981718192 in words is "one hundred ninety-one billion, nine hundred eighty-one million, seven hundred eighteen thousand, one hundred ninety-two".