631647673 has 4 divisors (see below), whose sum is σ = 632914000. Its totient is φ = 630381348.

The previous prime is 631647557. The next prime is 631647719. The reversal of 631647673 is 376746136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631647673 - 2⁹ = 631647161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631647773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632415 + ... + 633412.

It is an arithmetic number, because the mean of its divisors is an integer number (158228500).

Almost surely, 2^631647673 is an apocalyptic number.

It is an amenable number.

631647673 is a deficient number, since it is larger than the sum of its proper divisors (1266327).

631647673 is a wasteful number, since it uses less digits than its factorization.

631647673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266326.

The product of its digits is 381024, while the sum is 43.

The square root of 631647673 is about 25132.6017952778. The cubic root of 631647673 is about 858.0085854104.

The spelling of 631647673 in words is "six hundred thirty-one million, six hundred forty-seven thousand, six hundred seventy-three".