648131 has 4 divisors (see below), whose sum is σ = 707064. Its totient is φ = 589200.

The previous prime is 648119. The next prime is 648133. The reversal of 648131 is 131846.

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-648131 is a prime.

It is a super-2 number, since 2×648131² = 840147586322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648097 and 648106.

It is not an unprimeable number, because it can be changed into a prime (648133) 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, 29450 + ... + 29471.

It is an arithmetic number, because the mean of its divisors is an integer number (176766).

2⁶⁴⁸¹³¹ is an apocalyptic number.

648131 is a deficient number, since it is larger than the sum of its proper divisors (58933).

648131 is a wasteful number, since it uses less digits than its factorization.

648131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58932.

The product of its digits is 576, while the sum is 23.

The square root of 648131 is about 805.0658358172. The cubic root of 648131 is about 86.5408051432.

Adding to 648131 its reverse (131846), we get a palindrome (779977).

The spelling of 648131 in words is "six hundred forty-eight thousand, one hundred thirty-one".