650861 has 2 divisors, whose sum is σ = 650862. Its totient is φ = 650860.

The previous prime is 650851. The next prime is 650863. The reversal of 650861 is 168056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 1225 = 806^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650861 is a prime.

Together with 650863, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 650861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650863) 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 as a sum of consecutive naturals, namely, 325430 + 325431.

It is an arithmetic number, because the mean of its divisors is an integer number (325431).

2⁶⁵⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

650861 is a deficient number, since it is larger than the sum of its proper divisors (1).

650861 is an equidigital number, since it uses as much as digits as its factorization.

650861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 650861 is about 806.7595676532. The cubic root of 650861 is about 86.6621414468.

The spelling of 650861 in words is "six hundred fifty thousand, eight hundred sixty-one".