191872113 has 8 divisors (see below), whose sum is σ = 264082176. Its totient is φ = 123788400.

The previous prime is 191872097. The next prime is 191872117. The reversal of 191872113 is 311278191.

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

It is not a de Polignac number, because 191872113 - 2⁴ = 191872097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191872117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031478 + ... + 1031663.

It is an arithmetic number, because the mean of its divisors is an integer number (33010272).

Almost surely, 2^191872113 is an apocalyptic number.

It is an amenable number.

191872113 is a deficient number, since it is larger than the sum of its proper divisors (72210063).

191872113 is a wasteful number, since it uses less digits than its factorization.

191872113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063175.

The product of its digits is 3024, while the sum is 33.

The square root of 191872113 is about 13851.7909672360. The cubic root of 191872113 is about 576.7717128886.

The spelling of 191872113 in words is "one hundred ninety-one million, eight hundred seventy-two thousand, one hundred thirteen".