191138171 has 6 divisors (see below), whose sum is σ = 222344460. Its totient is φ = 163832676.

The previous prime is 191138161. The next prime is 191138173. The reversal of 191138171 is 171831191.

It is a happy number.

It is not a de Polignac number, because 191138171 - 2¹⁸ = 190876027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191138173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1950341 + ... + 1950438.

It is an arithmetic number, because the mean of its divisors is an integer number (37057410).

Almost surely, 2^191138171 is an apocalyptic number.

191138171 is a deficient number, since it is larger than the sum of its proper divisors (31206289).

191138171 is an equidigital number, since it uses as much as digits as its factorization.

191138171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900793 (or 3900786 counting only the distinct ones).

The product of its digits is 1512, while the sum is 32.

The square root of 191138171 is about 13825.2729086988. The cubic root of 191138171 is about 576.0353580324.

The spelling of 191138171 in words is "one hundred ninety-one million, one hundred thirty-eight thousand, one hundred seventy-one".