671434909 has 2 divisors, whose sum is σ = 671434910. Its totient is φ = 671434908.

The previous prime is 671434879. The next prime is 671434919. The reversal of 671434909 is 909434176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605012409 + 66422500 = 24597^2 + 8150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671434909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671434919) 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, 335717454 + 335717455.

It is an arithmetic number, because the mean of its divisors is an integer number (335717455).

Almost surely, 2^671434909 is an apocalyptic number.

It is an amenable number.

671434909 is a deficient number, since it is larger than the sum of its proper divisors (1).

671434909 is an equidigital number, since it uses as much as digits as its factorization.

671434909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 671434909 is about 25912.0610720182. The cubic root of 671434909 is about 875.6582405891.

The spelling of 671434909 in words is "six hundred seventy-one million, four hundred thirty-four thousand, nine hundred nine".