648631 has 2 divisors, whose sum is σ = 648632. Its totient is φ = 648630.

The previous prime is 648629. The next prime is 648649. The reversal of 648631 is 136846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648631 - 2¹ = 648629 is a prime.

It is a super-3 number, since 3×648631³ = 818680333644670773, which contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 648629, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648671) 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 as a sum of consecutive naturals, namely, 324315 + 324316.

It is an arithmetic number, because the mean of its divisors is an integer number (324316).

2⁶⁴⁸⁶³¹ is an apocalyptic number.

648631 is a deficient number, since it is larger than the sum of its proper divisors (1).

648631 is an equidigital number, since it uses as much as digits as its factorization.

648631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 648631 is about 805.3763095597. The cubic root of 648631 is about 86.5630533618.

The spelling of 648631 in words is "six hundred forty-eight thousand, six hundred thirty-one".