920645309 has 2 divisors, whose sum is σ = 920645310. Its totient is φ = 920645308.

The previous prime is 920645303. The next prime is 920645317. The reversal of 920645309 is 903546029.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879300409 + 41344900 = 29653^2 + 6430^2 .

It is a cyclic number.

It is not a de Polignac number, because 920645309 - 2⁸ = 920645053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (920645303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460322654 + 460322655.

It is an arithmetic number, because the mean of its divisors is an integer number (460322655).

Almost surely, 2^920645309 is an apocalyptic number.

It is an amenable number.

920645309 is a deficient number, since it is larger than the sum of its proper divisors (1).

920645309 is an equidigital number, since it uses as much as digits as its factorization.

920645309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 920645309 is about 30342.1375153432. The cubic root of 920645309 is about 972.8161717397.

The spelling of 920645309 in words is "nine hundred twenty million, six hundred forty-five thousand, three hundred nine".