648591 has 8 divisors (see below), whose sum is σ = 873600. Its totient is φ = 427992.

The previous prime is 648563. The next prime is 648607. The reversal of 648591 is 195846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 648591 - 2⁹ = 648079 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741 + ... + 1358.

It is an arithmetic number, because the mean of its divisors is an integer number (109200).

2⁶⁴⁸⁵⁹¹ is an apocalyptic number.

648591 is a deficient number, since it is larger than the sum of its proper divisors (225009).

648591 is a wasteful number, since it uses less digits than its factorization.

648591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205.

The product of its digits is 8640, while the sum is 33.

The square root of 648591 is about 805.3514760650. The cubic root of 648591 is about 86.5612739251.

Adding to 648591 its product of digits (8640), we get a triangular number (657231 = T₁₁₄₆).

The spelling of 648591 in words is "six hundred forty-eight thousand, five hundred ninety-one".