671548789 has 2 divisors, whose sum is σ = 671548790. Its totient is φ = 671548788.

The previous prime is 671548777. The next prime is 671548847. The reversal of 671548789 is 987845176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347188689 + 324360100 = 18633^2 + 18010^2 .

It is a cyclic number.

It is not a de Polignac number, because 671548789 - 2⁹ = 671548277 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 (671548729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335774394 + 335774395.

It is an arithmetic number, because the mean of its divisors is an integer number (335774395).

Almost surely, 2^671548789 is an apocalyptic number.

It is an amenable number.

671548789 is a deficient number, since it is larger than the sum of its proper divisors (1).

671548789 is an equidigital number, since it uses as much as digits as its factorization.

671548789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 55.

The square root of 671548789 is about 25914.2584111527. The cubic root of 671548789 is about 875.7077436865.

The spelling of 671548789 in words is "six hundred seventy-one million, five hundred forty-eight thousand, seven hundred eighty-nine".