650561 has 4 divisors (see below), whose sum is σ = 652224. Its totient is φ = 648900.

The previous prime is 650549. The next prime is 650563. The reversal of 650561 is 165056.

650561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 650561 - 2¹⁴ = 634177 is a prime.

It is a super-2 number, since 2×650561² = 846459229442, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 650561.

It is not an unprimeable number, because it can be changed into a prime (650563) 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, 116 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (163056).

2⁶⁵⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

650561 is a deficient number, since it is larger than the sum of its proper divisors (1663).

650561 is a wasteful number, since it uses less digits than its factorization.

650561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 650561 is about 806.5736172229. The cubic root of 650561 is about 86.6488244007.

The spelling of 650561 in words is "six hundred fifty thousand, five hundred sixty-one".