671846389 has 2 divisors, whose sum is σ = 671846390. Its totient is φ = 671846388.

The previous prime is 671846381. The next prime is 671846411. The reversal of 671846389 is 983648176.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664866225 + 6980164 = 25785^2 + 2642^2 .

It is a cyclic number.

It is not a de Polignac number, because 671846389 - 2³ = 671846381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671846381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335923194 + 335923195.

It is an arithmetic number, because the mean of its divisors is an integer number (335923195).

Almost surely, 2^671846389 is an apocalyptic number.

It is an amenable number.

671846389 is a deficient number, since it is larger than the sum of its proper divisors (1).

671846389 is an equidigital number, since it uses as much as digits as its factorization.

671846389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 671846389 is about 25919.9997878086. Note that the first 3 decimals coincide. The cubic root of 671846389 is about 875.8370825826.

The spelling of 671846389 in words is "six hundred seventy-one million, eight hundred forty-six thousand, three hundred eighty-nine".