194595521 has 2 divisors, whose sum is σ = 194595522. Its totient is φ = 194595520.

The previous prime is 194595509. The next prime is 194595601. The reversal of 194595521 is 125595491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194463025 + 132496 = 13945^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 194595521 - 2¹⁰ = 194594497 is a prime.

It is a super-2 number, since 2×194595521² = 75734833586522882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194525521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97297760 + 97297761.

It is an arithmetic number, because the mean of its divisors is an integer number (97297761).

Almost surely, 2^194595521 is an apocalyptic number.

It is an amenable number.

194595521 is a deficient number, since it is larger than the sum of its proper divisors (1).

194595521 is an equidigital number, since it uses as much as digits as its factorization.

194595521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 41.

The square root of 194595521 is about 13949.7498543881. The cubic root of 194595521 is about 579.4877770576.

The spelling of 194595521 in words is "one hundred ninety-four million, five hundred ninety-five thousand, five hundred twenty-one".