194959191 has 12 divisors (see below), whose sum is σ = 302385912. Its totient is φ = 111405168.

The previous prime is 194959169. The next prime is 194959207. The reversal of 194959191 is 191959491.

It is a happy number.

It is not a de Polignac number, because 194959191 - 2¹⁴ = 194942807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194959191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194959091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 662980 + ... + 663273.

It is an arithmetic number, because the mean of its divisors is an integer number (25198826).

Almost surely, 2^194959191 is an apocalyptic number.

194959191 is a deficient number, since it is larger than the sum of its proper divisors (107426721).

194959191 is a wasteful number, since it uses less digits than its factorization.

194959191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326270 (or 1326263 counting only the distinct ones).

The product of its digits is 131220, while the sum is 48.

The square root of 194959191 is about 13962.7787707175. The cubic root of 194959191 is about 579.8485444808.

The spelling of 194959191 in words is "one hundred ninety-four million, nine hundred fifty-nine thousand, one hundred ninety-one".