650989 has 4 divisors (see below), whose sum is σ = 654556. Its totient is φ = 647424.

The previous prime is 650987. The next prime is 651017. The reversal of 650989 is 989056.

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 455625 + 195364 = 675^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 650989 - 2¹ = 650987 is a prime.

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

It is a Duffinian number.

650989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650987) 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, 1494 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (163639).

2⁶⁵⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

650989 is a deficient number, since it is larger than the sum of its proper divisors (3567).

650989 is a wasteful number, since it uses less digits than its factorization.

650989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 650989 is about 806.8388934602. The cubic root of 650989 is about 86.6678221411.

The spelling of 650989 in words is "six hundred fifty thousand, nine hundred eighty-nine".