194115991 has 8 divisors (see below), whose sum is σ = 195555584. Its totient is φ = 192681720.

The previous prime is 194115983. The next prime is 194116007. The reversal of 194115991 is 199511491.

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

It is a cyclic number.

It is not a de Polignac number, because 194115991 - 2³ = 194115983 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 (194115941) 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 7 ways as a sum of consecutive naturals, for example, 96700 + ... + 98686.

It is an arithmetic number, because the mean of its divisors is an integer number (24444448).

Almost surely, 2^194115991 is an apocalyptic number.

194115991 is a deficient number, since it is larger than the sum of its proper divisors (1439593).

194115991 is a wasteful number, since it uses less digits than its factorization.

194115991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661.

The product of its digits is 14580, while the sum is 40.

The square root of 194115991 is about 13932.5514892284. The cubic root of 194115991 is about 579.0113866092.

The spelling of 194115991 in words is "one hundred ninety-four million, one hundred fifteen thousand, nine hundred ninety-one".