191797905238 has 4 divisors (see below), whose sum is σ = 287696857860. Its totient is φ = 95898952618.

The previous prime is 191797905217. The next prime is 191797905241. The reversal of 191797905238 is 832509797191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832509797191 = 6481 ⋅128453911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47949476308 + ... + 47949476311.

It is an arithmetic number, because the mean of its divisors is an integer number (71924214465).

Almost surely, 2^191797905238 is an apocalyptic number.

191797905238 is a deficient number, since it is larger than the sum of its proper divisors (95898952622).

191797905238 is an equidigital number, since it uses as much as digits as its factorization.

191797905238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95898952621.

The product of its (nonzero) digits is 8573040, while the sum is 61.

The spelling of 191797905238 in words is "one hundred ninety-one billion, seven hundred ninety-seven million, nine hundred five thousand, two hundred thirty-eight".