648541 has 4 divisors (see below), whose sum is σ = 652000. Its totient is φ = 645084.

The previous prime is 648509. The next prime is 648563. The reversal of 648541 is 145846.

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, and also an emirpimes, since its reverse is a distinct semiprime: 145846 = 2 ⋅72923.

It is a cyclic number.

It is not a de Polignac number, because 648541 - 2⁵ = 648509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431 + ... + 1828.

It is an arithmetic number, because the mean of its divisors is an integer number (163000).

2⁶⁴⁸⁵⁴¹ is an apocalyptic number.

It is an amenable number.

648541 is a deficient number, since it is larger than the sum of its proper divisors (3459).

648541 is a wasteful number, since it uses less digits than its factorization.

648541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458.

The product of its digits is 3840, while the sum is 28.

The square root of 648541 is about 805.3204331196. The cubic root of 648541 is about 86.5590495264.

The spelling of 648541 in words is "six hundred forty-eight thousand, five hundred forty-one".