190933991 has 4 divisors (see below), whose sum is σ = 197093184. Its totient is φ = 184774800.

The previous prime is 190933979. The next prime is 190933997. The reversal of 190933991 is 199339091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190933991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190933997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3079550 + ... + 3079611.

It is an arithmetic number, because the mean of its divisors is an integer number (49273296).

Almost surely, 2^190933991 is an apocalyptic number.

190933991 is a deficient number, since it is larger than the sum of its proper divisors (6159193).

190933991 is an equidigital number, since it uses as much as digits as its factorization.

190933991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6159192.

The product of its (nonzero) digits is 59049, while the sum is 44.

The square root of 190933991 is about 13817.8866329117. The cubic root of 190933991 is about 575.8301717289.

The spelling of 190933991 in words is "one hundred ninety million, nine hundred thirty-three thousand, nine hundred ninety-one".