193849813 has 2 divisors, whose sum is σ = 193849814. Its totient is φ = 193849812.

The previous prime is 193849757. The next prime is 193849847. The reversal of 193849813 is 318948391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134513604 + 59336209 = 11598^2 + 7703^2 .

It is a cyclic number.

It is not a de Polignac number, because 193849813 - 2¹³ = 193841621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193849883) 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 as a sum of consecutive naturals, namely, 96924906 + 96924907.

It is an arithmetic number, because the mean of its divisors is an integer number (96924907).

Almost surely, 2^193849813 is an apocalyptic number.

It is an amenable number.

193849813 is a deficient number, since it is larger than the sum of its proper divisors (1).

193849813 is an equidigital number, since it uses as much as digits as its factorization.

193849813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 193849813 is about 13922.9958342305. The cubic root of 193849813 is about 578.7466126278.

The spelling of 193849813 in words is "one hundred ninety-three million, eight hundred forty-nine thousand, eight hundred thirteen".