671770243 has 2 divisors, whose sum is σ = 671770244. Its totient is φ = 671770242.

The previous prime is 671770193. The next prime is 671770273. The reversal of 671770243 is 342077176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671770243 - 2²¹ = 669673091 is a prime.

It is not a weakly prime, because it can be changed into another prime (671770273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335885121 + 335885122.

It is an arithmetic number, because the mean of its divisors is an integer number (335885122).

Almost surely, 2^671770243 is an apocalyptic number.

671770243 is a deficient number, since it is larger than the sum of its proper divisors (1).

671770243 is an equidigital number, since it uses as much as digits as its factorization.

671770243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 671770243 is about 25918.5308804338. The cubic root of 671770243 is about 875.8039926723.

The spelling of 671770243 in words is "six hundred seventy-one million, seven hundred seventy thousand, two hundred forty-three".