650001021 has 16 divisors (see below), whose sum is σ = 875043648. Its totient is φ = 429161600.

The previous prime is 650000993. The next prime is 650001047. The reversal of 650001021 is 120100056.

It is a cyclic number.

It is not a de Polignac number, because 650001021 - 2¹⁹ = 649476733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650001061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200191 + ... + 203411.

It is an arithmetic number, because the mean of its divisors is an integer number (54690228).

Almost surely, 2^650001021 is an apocalyptic number.

It is an amenable number.

650001021 is a deficient number, since it is larger than the sum of its proper divisors (225042627).

650001021 is a wasteful number, since it uses less digits than its factorization.

650001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 650001021 is about 25495.1175914135. The cubic root of 650001021 is about 866.2395588946.

Adding to 650001021 its reverse (120100056), we get a palindrome (770101077).

The spelling of 650001021 in words is "six hundred fifty million, one thousand, twenty-one".