975990209 has 2 divisors, whose sum is σ = 975990210. Its totient is φ = 975990208.

The previous prime is 975990193. The next prime is 975990229. The reversal of 975990209 is 902099579.

975990209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 731161600 + 244828609 = 27040^2 + 15647^2 .

It is a cyclic number.

It is not a de Polignac number, because 975990209 - 2⁴ = 975990193 is a prime.

It is not a weakly prime, because it can be changed into another prime (975990229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487995104 + 487995105.

It is an arithmetic number, because the mean of its divisors is an integer number (487995105).

Almost surely, 2^975990209 is an apocalyptic number.

It is an amenable number.

975990209 is a deficient number, since it is larger than the sum of its proper divisors (1).

975990209 is an equidigital number, since it uses as much as digits as its factorization.

975990209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 459270, while the sum is 50.

The square root of 975990209 is about 31240.8420020972. The cubic root of 975990209 is about 991.9318158049.

The spelling of 975990209 in words is "nine hundred seventy-five million, nine hundred ninety thousand, two hundred nine".