994106221 has 2 divisors, whose sum is σ = 994106222. Its totient is φ = 994106220.

The previous prime is 994106173. The next prime is 994106231. The reversal of 994106221 is 122601499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 761208100 + 232898121 = 27590^2 + 15261^2 .

It is an emirp because it is prime and its reverse (122601499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994106221 - 2¹⁹ = 993581933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994106231) 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, 497053110 + 497053111.

It is an arithmetic number, because the mean of its divisors is an integer number (497053111).

Almost surely, 2^994106221 is an apocalyptic number.

It is an amenable number.

994106221 is a deficient number, since it is larger than the sum of its proper divisors (1).

994106221 is an equidigital number, since it uses as much as digits as its factorization.

994106221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 994106221 is about 31529.4500586357. The cubic root of 994106221 is about 998.0315346868.

The spelling of 994106221 in words is "nine hundred ninety-four million, one hundred six thousand, two hundred twenty-one".