191531987636196 has 24 divisors (see below), whose sum is σ = 446908840887040. Its totient is φ = 63843871630752.

The previous prime is 191531987636183. The next prime is 191531987636233. The reversal of 191531987636196 is 691636789135191.

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, 8998036 + ... + 21541323.

Almost surely, 2^{191531987636196} is an apocalyptic number.

It is an amenable number.

191531987636196 is an abundant number, since it is smaller than the sum of its proper divisors (255376853250844).

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

191531987636196 is a wasteful number, since it uses less digits than its factorization.

191531987636196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31062003 (or 31062001 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 75.

The spelling of 191531987636196 in words is "one hundred ninety-one trillion, five hundred thirty-one billion, nine hundred eighty-seven million, six hundred thirty-six thousand, one hundred ninety-six".