945041809 has 2 divisors, whose sum is σ = 945041810. Its totient is φ = 945041808.

The previous prime is 945041807. The next prime is 945041813. The reversal of 945041809 is 908140549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846635409 + 98406400 = 29097^2 + 9920^2 .

It is a cyclic number.

It is not a de Polignac number, because 945041809 - 2¹ = 945041807 is a prime.

Together with 945041807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (945041807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472520904 + 472520905.

It is an arithmetic number, because the mean of its divisors is an integer number (472520905).

Almost surely, 2^945041809 is an apocalyptic number.

It is an amenable number.

945041809 is a deficient number, since it is larger than the sum of its proper divisors (1).

945041809 is an equidigital number, since it uses as much as digits as its factorization.

945041809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 945041809 is about 30741.5323137933. The cubic root of 945041809 is about 981.3343648020.

The spelling of 945041809 in words is "nine hundred forty-five million, forty-one thousand, eight hundred nine".