194819213 has 2 divisors, whose sum is σ = 194819214. Its totient is φ = 194819212.

The previous prime is 194819173. The next prime is 194819237. The reversal of 194819213 is 312918491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171034084 + 23785129 = 13078^2 + 4877^2 .

It is a cyclic number.

It is not a de Polignac number, because 194819213 - 2¹⁰ = 194818189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194819263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97409606 + 97409607.

It is an arithmetic number, because the mean of its divisors is an integer number (97409607).

Almost surely, 2^194819213 is an apocalyptic number.

It is an amenable number.

194819213 is a deficient number, since it is larger than the sum of its proper divisors (1).

194819213 is an equidigital number, since it uses as much as digits as its factorization.

194819213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 194819213 is about 13957.7653297367. The cubic root of 194819213 is about 579.7097368458.

The spelling of 194819213 in words is "one hundred ninety-four million, eight hundred nineteen thousand, two hundred thirteen".