648531 has 24 divisors (see below), whose sum is σ = 1057056. Its totient is φ = 380160.

The previous prime is 648509. The next prime is 648563. The reversal of 648531 is 135846.

It is not a de Polignac number, because 648531 - 2⁹ = 648019 is a prime.

It is a super-2 number, since 2×648531² = 841184915922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648495 and 648504.

It is not an unprimeable number, because it can be changed into a prime (648331) 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 23 ways as a sum of consecutive naturals, for example, 2571 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (44044).

2⁶⁴⁸⁵³¹ is an apocalyptic number.

648531 is a deficient number, since it is larger than the sum of its proper divisors (408525).

648531 is a wasteful number, since it uses less digits than its factorization.

648531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 280 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 648531 is about 805.3142243870. The cubic root of 648531 is about 86.5586046330.

The spelling of 648531 in words is "six hundred forty-eight thousand, five hundred thirty-one".