671178449 has 2 divisors, whose sum is σ = 671178450. Its totient is φ = 671178448.

The previous prime is 671178413. The next prime is 671178451. The reversal of 671178449 is 944871176.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670810000 + 368449 = 25900^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 671178449 - 2¹² = 671174353 is a prime.

Together with 671178451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671178499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335589224 + 335589225.

It is an arithmetic number, because the mean of its divisors is an integer number (335589225).

Almost surely, 2^671178449 is an apocalyptic number.

It is an amenable number.

671178449 is a deficient number, since it is larger than the sum of its proper divisors (1).

671178449 is an equidigital number, since it uses as much as digits as its factorization.

671178449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 671178449 is about 25907.1119386164. Note that the first 3 decimals coincide. The cubic root of 671178449 is about 875.5467381398.

The spelling of 671178449 in words is "six hundred seventy-one million, one hundred seventy-eight thousand, four hundred forty-nine".