650681 has 4 divisors (see below), whose sum is σ = 663012. Its totient is φ = 638352.

The previous prime is 650669. The next prime is 650701. The reversal of 650681 is 186056.

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

It can be written as a sum of positive squares in 2 ways, for example, as 241081 + 409600 = 491^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 650681 - 2¹⁰ = 649657 is a prime.

It is a super-2 number, since 2×650681² = 846771527522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 650681.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 650681.

It is not an unprimeable number, because it can be changed into a prime (650081) 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, 6086 + ... + 6191.

It is an arithmetic number, because the mean of its divisors is an integer number (165753).

2⁶⁵⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

650681 is a deficient number, since it is larger than the sum of its proper divisors (12331).

650681 is a wasteful number, since it uses less digits than its factorization.

650681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12330.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 650681 is about 806.6480025389. The cubic root of 650681 is about 86.6541517103.

It can be divided in two parts, 650 and 681, that added together give a palindrome (1331).

The spelling of 650681 in words is "six hundred fifty thousand, six hundred eighty-one".