648629 has 2 divisors, whose sum is σ = 648630. Its totient is φ = 648628.

The previous prime is 648619. The next prime is 648631. The reversal of 648629 is 926846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362404 + 286225 = 602^2 + 535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648629 is a prime.

Together with 648631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648629.

It is not a weakly prime, because it can be changed into another prime (648619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324314 + 324315.

It is an arithmetic number, because the mean of its divisors is an integer number (324315).

2⁶⁴⁸⁶²⁹ is an apocalyptic number.

It is an amenable number.

648629 is a deficient number, since it is larger than the sum of its proper divisors (1).

648629 is an equidigital number, since it uses as much as digits as its factorization.

648629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 648629 is about 805.3750679031. The cubic root of 648629 is about 86.5629643917.

The spelling of 648629 in words is "six hundred forty-eight thousand, six hundred twenty-nine".