845293921 has 2 divisors, whose sum is σ = 845293922. Its totient is φ = 845293920.

The previous prime is 845293913. The next prime is 845293927. The reversal of 845293921 is 129392548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630261025 + 215032896 = 25105^2 + 14664^2 .

It is a cyclic number.

It is not a de Polignac number, because 845293921 - 2³ = 845293913 is a prime.

It is not a weakly prime, because it can be changed into another prime (845293927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422646960 + 422646961.

It is an arithmetic number, because the mean of its divisors is an integer number (422646961).

Almost surely, 2^845293921 is an apocalyptic number.

It is an amenable number.

845293921 is a deficient number, since it is larger than the sum of its proper divisors (1).

845293921 is an equidigital number, since it uses as much as digits as its factorization.

845293921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 845293921 is about 29073.9388628373. The cubic root of 845293921 is about 945.5167972870.

The spelling of 845293921 in words is "eight hundred forty-five million, two hundred ninety-three thousand, nine hundred twenty-one".