671572789 has 2 divisors, whose sum is σ = 671572790. Its totient is φ = 671572788.

The previous prime is 671572739. The next prime is 671572817. The reversal of 671572789 is 987275176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433888900 + 237683889 = 20830^2 + 15417^2 .

It is a cyclic number.

It is not a de Polignac number, because 671572789 - 2¹¹ = 671570741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671572739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335786394 + 335786395.

It is an arithmetic number, because the mean of its divisors is an integer number (335786395).

Almost surely, 2^671572789 is an apocalyptic number.

It is an amenable number.

671572789 is a deficient number, since it is larger than the sum of its proper divisors (1).

671572789 is an equidigital number, since it uses as much as digits as its factorization.

671572789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 52.

The square root of 671572789 is about 25914.7214725530. The cubic root of 671572789 is about 875.7181756590.

The spelling of 671572789 in words is "six hundred seventy-one million, five hundred seventy-two thousand, seven hundred eighty-nine".