648523 has 4 divisors (see below), whose sum is σ = 652288. Its totient is φ = 644760.

The previous prime is 648509. The next prime is 648563. The reversal of 648523 is 325846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648523 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648491 and 648500.

It is not an unprimeable number, because it can be changed into a prime (648563) 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, 1611 + ... + 1972.

It is an arithmetic number, because the mean of its divisors is an integer number (163072).

2⁶⁴⁸⁵²³ is an apocalyptic number.

648523 is a deficient number, since it is larger than the sum of its proper divisors (3765).

648523 is a wasteful number, since it uses less digits than its factorization.

648523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3764.

The product of its digits is 5760, while the sum is 28.

The square root of 648523 is about 805.3092573664. The cubic root of 648523 is about 86.5582487149.

The spelling of 648523 in words is "six hundred forty-eight thousand, five hundred twenty-three".