648111 has 4 divisors (see below), whose sum is σ = 864152. Its totient is φ = 432072.

The previous prime is 648107. The next prime is 648119. The reversal of 648111 is 111846.

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

It is not a de Polignac number, because 648111 - 2² = 648107 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648119) 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, 108016 + ... + 108021.

It is an arithmetic number, because the mean of its divisors is an integer number (216038).

2⁶⁴⁸¹¹¹ is an apocalyptic number.

648111 is a deficient number, since it is larger than the sum of its proper divisors (216041).

648111 is a wasteful number, since it uses less digits than its factorization.

648111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216040.

The product of its digits is 192, while the sum is 21.

The square root of 648111 is about 805.0534143770. The cubic root of 648111 is about 86.5399149765.

Adding to 648111 its reverse (111846), we get a palindrome (759957).

The spelling of 648111 in words is "six hundred forty-eight thousand, one hundred eleven".