646131 has 8 divisors (see below), whose sum is σ = 884944. Its totient is φ = 419040.

The previous prime is 646103. The next prime is 646147. The reversal of 646131 is 131646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646131 - 2⁵ = 646099 is a prime.

It is a super-2 number, since 2×646131² = 834970538322, 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 = 646098 and 646107.

It is not an unprimeable number, because it can be changed into a prime (646181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2800 + ... + 3021.

It is an arithmetic number, because the mean of its divisors is an integer number (110618).

2⁶⁴⁶¹³¹ is an apocalyptic number.

646131 is a deficient number, since it is larger than the sum of its proper divisors (238813).

646131 is a wasteful number, since it uses less digits than its factorization.

646131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5861.

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

The square root of 646131 is about 803.8227416539. The cubic root of 646131 is about 86.4516976698.

Adding to 646131 its reverse (131646), we get a palindrome (777777).

It can be divided in two parts, 646 and 131, that added together give a palindrome (777).

The spelling of 646131 in words is "six hundred forty-six thousand, one hundred thirty-one".