6640131 has 16 divisors (see below), whose sum is σ = 9173504. Its totient is φ = 4269024.

The previous prime is 6640129. The next prime is 6640157. The reversal of 6640131 is 1310466.

It is not a de Polignac number, because 6640131 - 2¹ = 6640129 is a prime.

It is a super-2 number, since 2×6640131² = 88182679394322, 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 = 6640098 and 6640107.

It is not an unprimeable number, because it can be changed into a prime (6640111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17910 + ... + 18276.

It is an arithmetic number, because the mean of its divisors is an integer number (573344).

Almost surely, 2^6640131 is an apocalyptic number.

6640131 is a deficient number, since it is larger than the sum of its proper divisors (2533373).

6640131 is a wasteful number, since it uses less digits than its factorization.

6640131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 6640131 is about 2576.8451641494. The cubic root of 6640131 is about 187.9571635465.

Adding to 6640131 its reverse (1310466), we get a palindrome (7950597).

The spelling of 6640131 in words is "six million, six hundred forty thousand, one hundred thirty-one".