191923201 has 8 divisors (see below), whose sum is σ = 206728704. Its totient is φ = 177656160.

The previous prime is 191923117. The next prime is 191923211. The reversal of 191923201 is 102329191.

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-191923201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191923201.

It is not an unprimeable number, because it can be changed into a prime (191923211) 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, 133876 + ... + 135301.

It is an arithmetic number, because the mean of its divisors is an integer number (25841088).

Almost surely, 2^191923201 is an apocalyptic number.

It is an amenable number.

191923201 is a deficient number, since it is larger than the sum of its proper divisors (14805503).

191923201 is a wasteful number, since it uses less digits than its factorization.

191923201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269231.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 191923201 is about 13853.6349381670. The cubic root of 191923201 is about 576.8228988894.

The spelling of 191923201 in words is "one hundred ninety-one million, nine hundred twenty-three thousand, two hundred one".