648919 has 4 divisors (see below), whose sum is σ = 651496. Its totient is φ = 646344.

The previous prime is 648917. The next prime is 648931. The reversal of 648919 is 919846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919846 = 2 ⋅459923.

It is a cyclic number.

It is not a de Polignac number, because 648919 - 2¹ = 648917 is a prime.

It is a super-2 number, since 2×648919² = 842191737122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864 + ... + 1429.

It is an arithmetic number, because the mean of its divisors is an integer number (162874).

2⁶⁴⁸⁹¹⁹ is an apocalyptic number.

648919 is a deficient number, since it is larger than the sum of its proper divisors (2577).

648919 is a wasteful number, since it uses less digits than its factorization.

648919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its digits is 15552, while the sum is 37.

The square root of 648919 is about 805.5550881225. Note that the first 3 decimals coincide. The cubic root of 648919 is about 86.5758631465.

The spelling of 648919 in words is "six hundred forty-eight thousand, nine hundred nineteen".