631647671 has 4 divisors (see below), whose sum is σ = 631719144. Its totient is φ = 631576200.

The previous prime is 631647557. The next prime is 631647719. The reversal of 631647671 is 176746136.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631647671 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 (631647371) 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, 20240 + ... + 40901.

It is an arithmetic number, because the mean of its divisors is an integer number (157929786).

Almost surely, 2^631647671 is an apocalyptic number.

631647671 is a deficient number, since it is larger than the sum of its proper divisors (71473).

631647671 is a wasteful number, since it uses less digits than its factorization.

631647671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71472.

The product of its digits is 127008, while the sum is 41.

The square root of 631647671 is about 25132.6017554888. The cubic root of 631647671 is about 858.0085845049.

The spelling of 631647671 in words is "six hundred thirty-one million, six hundred forty-seven thousand, six hundred seventy-one".