609021 has 18 divisors (see below), whose sum is σ = 1024062. Its totient is φ = 347760.

The previous prime is 608999. The next prime is 609043. The reversal of 609021 is 120906.

It is an interprime number because it is at equal distance from previous prime (608999) and next prime (609043).

It can be written as a sum of positive squares in only one way, i.e., 509796 + 99225 = 714^2 + 315^2 .

It is not a de Polignac number, because 609021 - 2⁵ = 608989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 608985 and 609003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609071) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 250 + ... + 1131.

2⁶⁰⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

609021 is a deficient number, since it is larger than the sum of its proper divisors (415041).

609021 is a wasteful number, since it uses less digits than its factorization.

609021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 609021 is about 780.3979753946. The cubic root of 609021 is about 84.7638659538.

Adding to 609021 its reverse (120906), we get a palindrome (729927).

The spelling of 609021 in words is "six hundred nine thousand, twenty-one".