945989509 has 2 divisors, whose sum is σ = 945989510. Its totient is φ = 945989508.

The previous prime is 945989507. The next prime is 945989621. The reversal of 945989509 is 905989549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 816530625 + 129458884 = 28575^2 + 11378^2 .

It is an emirp because it is prime and its reverse (905989549) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 945989509 - 2¹ = 945989507 is a prime.

It is a super-2 number, since 2×945989509² = 1789792302276122162, which contains 22 as substring.

Together with 945989507, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945989507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472994754 + 472994755.

It is an arithmetic number, because the mean of its divisors is an integer number (472994755).

Almost surely, 2^945989509 is an apocalyptic number.

It is an amenable number.

945989509 is a deficient number, since it is larger than the sum of its proper divisors (1).

945989509 is an equidigital number, since it uses as much as digits as its factorization.

945989509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5248800, while the sum is 58.

The square root of 945989509 is about 30756.9424520709. The cubic root of 945989509 is about 981.6622867579.

The spelling of 945989509 in words is "nine hundred forty-five million, nine hundred eighty-nine thousand, five hundred nine".