945555109 has 2 divisors, whose sum is σ = 945555110. Its totient is φ = 945555108.

The previous prime is 945555097. The next prime is 945555119. The reversal of 945555109 is 901555549.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 542750209 + 402804900 = 23297^2 + 20070^2 .

It is a cyclic number.

It is not a de Polignac number, because 945555109 - 2⁵ = 945555077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945555119) 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, 472777554 + 472777555.

It is an arithmetic number, because the mean of its divisors is an integer number (472777555).

Almost surely, 2^945555109 is an apocalyptic number.

It is an amenable number.

945555109 is a deficient number, since it is larger than the sum of its proper divisors (1).

945555109 is an equidigital number, since it uses as much as digits as its factorization.

945555109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 43.

The square root of 945555109 is about 30749.8798209034. The cubic root of 945555109 is about 981.5120034186.

The spelling of 945555109 in words is "nine hundred forty-five million, five hundred fifty-five thousand, one hundred nine".