648449 has 2 divisors, whose sum is σ = 648450. Its totient is φ = 648448.

The previous prime is 648437. The next prime is 648481. The reversal of 648449 is 944846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628849 + 19600 = 793^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 648449 - 2⁴ = 648433 is a prime.

It is a super-2 number, since 2×648449² = 840972211202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁴ + 4⁵ + 4⁷ + 8⁵ + 4⁸ + 9⁶ .

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (648649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324224 + 324225.

It is an arithmetic number, because the mean of its divisors is an integer number (324225).

2⁶⁴⁸⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

648449 is a deficient number, since it is larger than the sum of its proper divisors (1).

648449 is an equidigital number, since it uses as much as digits as its factorization.

648449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 648449 is about 805.2633109735. The cubic root of 648449 is about 86.5549563341.

The spelling of 648449 in words is "six hundred forty-eight thousand, four hundred forty-nine".