671069221 has 2 divisors, whose sum is σ = 671069222. Its totient is φ = 671069220.

The previous prime is 671069177. The next prime is 671069257. The reversal of 671069221 is 122960176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671069025 + 196 = 25905^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 671069221 - 2⁹ = 671068709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671069261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335534610 + 335534611.

It is an arithmetic number, because the mean of its divisors is an integer number (335534611).

Almost surely, 2^671069221 is an apocalyptic number.

It is an amenable number.

671069221 is a deficient number, since it is larger than the sum of its proper divisors (1).

671069221 is an equidigital number, since it uses as much as digits as its factorization.

671069221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 671069221 is about 25905.0037830532. The cubic root of 671069221 is about 875.4992398887.

The spelling of 671069221 in words is "six hundred seventy-one million, sixty-nine thousand, two hundred twenty-one".