648261 has 24 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 383616.

The previous prime is 648259. The next prime is 648269. The reversal of 648261 is 162846.

It is not a de Polignac number, because 648261 - 2¹ = 648259 is a prime.

It is a Curzon number.

648261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2796 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁶⁴⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

648261 is a deficient number, since it is larger than the sum of its proper divisors (400059).

648261 is a wasteful number, since it uses less digits than its factorization.

648261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 262 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 648261 is about 805.1465705075. The cubic root of 648261 is about 86.5465907805.

It can be divided in two parts, 648 and 261, that added together give a palindrome (909).

The spelling of 648261 in words is "six hundred forty-eight thousand, two hundred sixty-one".