194499991 has 4 divisors (see below), whose sum is σ = 222285712. Its totient is φ = 166714272.

The previous prime is 194499989. The next prime is 194500001. The reversal of 194499991 is 199994491.

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

It is a cyclic number.

It is not a de Polignac number, because 194499991 - 2¹ = 194499989 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 (194497991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13892850 + ... + 13892863.

It is an arithmetic number, because the mean of its divisors is an integer number (55571428).

Almost surely, 2^194499991 is an apocalyptic number.

194499991 is a deficient number, since it is larger than the sum of its proper divisors (27785721).

194499991 is an equidigital number, since it uses as much as digits as its factorization.

194499991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27785720.

The product of its digits is 944784, while the sum is 55.

The square root of 194499991 is about 13946.3253583157. The cubic root of 194499991 is about 579.3929349833.

The spelling of 194499991 in words is "one hundred ninety-four million, four hundred ninety-nine thousand, nine hundred ninety-one".