671303405 has 4 divisors (see below), whose sum is σ = 805564092. Its totient is φ = 537042720.

The previous prime is 671303389. The next prime is 671303407. The reversal of 671303405 is 504303176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103815721 + 567487684 = 10189^2 + 23822^2 .

It is not a de Polignac number, because 671303405 - 2⁴ = 671303389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671303407) 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 in 3 ways as a sum of consecutive naturals, for example, 67130336 + ... + 67130345.

It is an arithmetic number, because the mean of its divisors is an integer number (201391023).

Almost surely, 2^671303405 is an apocalyptic number.

It is an amenable number.

671303405 is a deficient number, since it is larger than the sum of its proper divisors (134260687).

671303405 is a wasteful number, since it uses less digits than its factorization.

671303405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134260686.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 671303405 is about 25909.5234421631. The cubic root of 671303405 is about 875.6010694579.

The spelling of 671303405 in words is "six hundred seventy-one million, three hundred three thousand, four hundred five".