845344289 has 2 divisors, whose sum is σ = 845344290. Its totient is φ = 845344288.

The previous prime is 845344249. The next prime is 845344309. The reversal of 845344289 is 982443548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817960000 + 27384289 = 28600^2 + 5233^2 .

It is a cyclic number.

It is not a de Polignac number, because 845344289 - 2⁸ = 845344033 is a prime.

It is not a weakly prime, because it can be changed into another prime (845344249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422672144 + 422672145.

It is an arithmetic number, because the mean of its divisors is an integer number (422672145).

Almost surely, 2^845344289 is an apocalyptic number.

It is an amenable number.

845344289 is a deficient number, since it is larger than the sum of its proper divisors (1).

845344289 is an equidigital number, since it uses as much as digits as its factorization.

845344289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 47.

The square root of 845344289 is about 29074.8050552364. The cubic root of 845344289 is about 945.5355768866.

The spelling of 845344289 in words is "eight hundred forty-five million, three hundred forty-four thousand, two hundred eighty-nine".