671605247 has 4 divisors (see below), whose sum is σ = 711111456. Its totient is φ = 632099040.

The previous prime is 671605243. The next prime is 671605271. The reversal of 671605247 is 742506176.

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

It is a cyclic number.

It is not a de Polignac number, because 671605247 - 2² = 671605243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671605247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671605243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19753079 + ... + 19753112.

It is an arithmetic number, because the mean of its divisors is an integer number (177777864).

Almost surely, 2^671605247 is an apocalyptic number.

671605247 is a deficient number, since it is larger than the sum of its proper divisors (39506209).

671605247 is a wasteful number, since it uses less digits than its factorization.

671605247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39506208.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 671605247 is about 25915.3477113466. The cubic root of 671605247 is about 875.7322836372.

The spelling of 671605247 in words is "six hundred seventy-one million, six hundred five thousand, two hundred forty-seven".