945870221 has 2 divisors, whose sum is σ = 945870222. Its totient is φ = 945870220.

The previous prime is 945870203. The next prime is 945870223. The reversal of 945870221 is 122078549.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945870025 + 196 = 30755^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 945870221 - 2²⁶ = 878761357 is a prime.

Together with 945870223, 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 (945870223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472935110 + 472935111.

It is an arithmetic number, because the mean of its divisors is an integer number (472935111).

Almost surely, 2^945870221 is an apocalyptic number.

It is an amenable number.

945870221 is a deficient number, since it is larger than the sum of its proper divisors (1).

945870221 is an equidigital number, since it uses as much as digits as its factorization.

945870221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 945870221 is about 30755.0031864736. The cubic root of 945870221 is about 981.6210229270.

The spelling of 945870221 in words is "nine hundred forty-five million, eight hundred seventy thousand, two hundred twenty-one".