191899334842 has 8 divisors (see below), whose sum is σ = 287853207732. Its totient is φ = 95948265600.

The previous prime is 191899334831. The next prime is 191899334881. The reversal of 191899334842 is 248433998191.

It can be written as a sum of positive squares in 2 ways, for example, as 167697621081 + 24201713761 = 409509^2 + 155569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 520509 + ... + 809152.

Almost surely, 2^191899334842 is an apocalyptic number.

191899334842 is a deficient number, since it is larger than the sum of its proper divisors (95953872890).

191899334842 is a wasteful number, since it uses less digits than its factorization.

191899334842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401824.

The product of its digits is 13436928, while the sum is 61.

The spelling of 191899334842 in words is "one hundred ninety-one billion, eight hundred ninety-nine million, three hundred thirty-four thousand, eight hundred forty-two".