194632813 has 4 divisors (see below), whose sum is σ = 206081820. Its totient is φ = 183183808.

The previous prime is 194632777. The next prime is 194632829. The reversal of 194632813 is 318236491.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123365449 + 71267364 = 11107^2 + 8442^2 .

It is a cyclic number.

It is not a de Polignac number, because 194632813 - 2⁹ = 194632301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194632843) 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 3 ways as a sum of consecutive naturals, for example, 5724478 + ... + 5724511.

It is an arithmetic number, because the mean of its divisors is an integer number (51520455).

Almost surely, 2^194632813 is an apocalyptic number.

It is an amenable number.

194632813 is a deficient number, since it is larger than the sum of its proper divisors (11449007).

194632813 is a wasteful number, since it uses less digits than its factorization.

194632813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11449006.

The product of its digits is 31104, while the sum is 37.

The square root of 194632813 is about 13951.0864451483. The cubic root of 194632813 is about 579.5247920888.

The spelling of 194632813 in words is "one hundred ninety-four million, six hundred thirty-two thousand, eight hundred thirteen".