648913 has 4 divisors (see below), whose sum is σ = 664048. Its totient is φ = 633780.

The previous prime is 648911. The next prime is 648917. The reversal of 648913 is 319846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648913 - 2¹ = 648911 is a prime.

It is a Duffinian number.

648913 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (648911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7503 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (166012).

2⁶⁴⁸⁹¹³ is an apocalyptic number.

It is an amenable number.

648913 is a deficient number, since it is larger than the sum of its proper divisors (15135).

648913 is a wasteful number, since it uses less digits than its factorization.

648913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15134.

The product of its digits is 5184, while the sum is 31.

The square root of 648913 is about 805.5513639738. The cubic root of 648913 is about 86.5755963147.

The spelling of 648913 in words is "six hundred forty-eight thousand, nine hundred thirteen".