191390195 has 8 divisors (see below), whose sum is σ = 229840800. Its totient is φ = 152997120.

The previous prime is 191390191. The next prime is 191390197. The reversal of 191390195 is 591093191.

It is a happy number.

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

It is not a de Polignac number, because 191390195 - 2² = 191390191 is a prime.

It is a super-3 number, since 3×191390195³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (191390191) 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, 6686 + ... + 20675.

It is an arithmetic number, because the mean of its divisors is an integer number (28730100).

Almost surely, 2^191390195 is an apocalyptic number.

191390195 is a deficient number, since it is larger than the sum of its proper divisors (38450605).

191390195 is a wasteful number, since it uses less digits than its factorization.

191390195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28765.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 191390195 is about 13834.3845182935. The cubic root of 191390195 is about 576.2884227387.

The spelling of 191390195 in words is "one hundred ninety-one million, three hundred ninety thousand, one hundred ninety-five".