949172209 has 2 divisors, whose sum is σ = 949172210. Its totient is φ = 949172208.

The previous prime is 949172171. The next prime is 949172221. The reversal of 949172209 is 902271949.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803439025 + 145733184 = 28345^2 + 12072^2 .

It is an emirp because it is prime and its reverse (902271949) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 949172209 - 2⁹ = 949171697 is a prime.

It is not a weakly prime, because it can be changed into another prime (949172269) 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, 474586104 + 474586105.

It is an arithmetic number, because the mean of its divisors is an integer number (474586105).

Almost surely, 2^949172209 is an apocalyptic number.

It is an amenable number.

949172209 is a deficient number, since it is larger than the sum of its proper divisors (1).

949172209 is an equidigital number, since it uses as much as digits as its factorization.

949172209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 949172209 is about 30808.6385450575. The cubic root of 949172209 is about 982.7619604193.

The spelling of 949172209 in words is "nine hundred forty-nine million, one hundred seventy-two thousand, two hundred nine".