194309149 has 4 divisors (see below), whose sum is σ = 194412636. Its totient is φ = 194205664.

The previous prime is 194309113. The next prime is 194309189. The reversal of 194309149 is 941903491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941903491 = 79 ⋅11922829.

It can be written as a sum of positive squares in 2 ways, for example, as 141848100 + 52461049 = 11910^2 + 7243^2 .

It is a cyclic number.

It is not a de Polignac number, because 194309149 - 2⁷ = 194309021 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 (194309189) 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, 48874 + ... + 52699.

It is an arithmetic number, because the mean of its divisors is an integer number (48603159).

Almost surely, 2^194309149 is an apocalyptic number.

It is an amenable number.

194309149 is a deficient number, since it is larger than the sum of its proper divisors (103487).

194309149 is a wasteful number, since it uses less digits than its factorization.

194309149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103486.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 194309149 is about 13939.4816618122. The cubic root of 194309149 is about 579.2033742366.

The spelling of 194309149 in words is "one hundred ninety-four million, three hundred nine thousand, one hundred forty-nine".