845574221 has 2 divisors, whose sum is σ = 845574222. Its totient is φ = 845574220.

The previous prime is 845574173. The next prime is 845574251. The reversal of 845574221 is 122475548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823116100 + 22458121 = 28690^2 + 4739^2 .

It is a cyclic number.

It is not a de Polignac number, because 845574221 - 2¹⁴ = 845557837 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 (845574251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422787110 + 422787111.

It is an arithmetic number, because the mean of its divisors is an integer number (422787111).

Almost surely, 2^845574221 is an apocalyptic number.

It is an amenable number.

845574221 is a deficient number, since it is larger than the sum of its proper divisors (1).

845574221 is an equidigital number, since it uses as much as digits as its factorization.

845574221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 38.

The square root of 845574221 is about 29078.7589315638. The cubic root of 845574221 is about 945.6212970603.

The spelling of 845574221 in words is "eight hundred forty-five million, five hundred seventy-four thousand, two hundred twenty-one".