650631 has 4 divisors (see below), whose sum is σ = 867512. Its totient is φ = 433752.

The previous prime is 650627. The next prime is 650669. The reversal of 650631 is 136056.

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

It is not a de Polignac number, because 650631 - 2² = 650627 is a prime.

It is a super-2 number, since 2×650631² = 846641396322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 650598 and 650607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (600631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108436 + ... + 108441.

It is an arithmetic number, because the mean of its divisors is an integer number (216878).

2⁶⁵⁰⁶³¹ is an apocalyptic number.

650631 is a deficient number, since it is larger than the sum of its proper divisors (216881).

650631 is a wasteful number, since it uses less digits than its factorization.

650631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216880.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 650631 is about 806.6170094909. The cubic root of 650631 is about 86.6519320776.

Adding to 650631 its reverse (136056), we get a palindrome (786687).

The spelling of 650631 in words is "six hundred fifty thousand, six hundred thirty-one".