648481 has 2 divisors, whose sum is σ = 648482. Its totient is φ = 648480.

The previous prime is 648449. The next prime is 648509. The reversal of 648481 is 184846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467856 + 180625 = 684^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 648481 - 2⁵ = 648449 is a prime.

It is a super-2 number, since 2×648481² = 841055214722, which contains 22 as substring.

648481 is a lucky number.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (648181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324240 + 324241.

It is an arithmetic number, because the mean of its divisors is an integer number (324241).

2⁶⁴⁸⁴⁸¹ is an apocalyptic number.

It is an amenable number.

648481 is a deficient number, since it is larger than the sum of its proper divisors (1).

648481 is an equidigital number, since it uses as much as digits as its factorization.

648481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 31.

The square root of 648481 is about 805.2831800056. The cubic root of 648481 is about 86.5563800971.

The spelling of 648481 in words is "six hundred forty-eight thousand, four hundred eighty-one".