191173993 has 8 divisors (see below), whose sum is σ = 208949760. Its totient is φ = 174123840.

The previous prime is 191173963. The next prime is 191174017. The reversal of 191173993 is 399371191.

It is a happy number.

191173993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191173993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191173903) 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, 180853 + ... + 181906.

It is an arithmetic number, because the mean of its divisors is an integer number (26118720).

Almost surely, 2^191173993 is an apocalyptic number.

It is an amenable number.

191173993 is a deficient number, since it is larger than the sum of its proper divisors (17775767).

191173993 is a wasteful number, since it uses less digits than its factorization.

191173993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362807.

The product of its digits is 45927, while the sum is 43.

The square root of 191173993 is about 13826.5683739676. The cubic root of 191173993 is about 576.0713415123.

The spelling of 191173993 in words is "one hundred ninety-one million, one hundred seventy-three thousand, nine hundred ninety-three".