662509 has 4 divisors (see below), whose sum is σ = 665500. Its totient is φ = 659520.

The previous prime is 662491. The next prime is 662513. The reversal of 662509 is 905266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905266 = 2 ⋅452633.

It can be written as a sum of positive squares in 2 ways, for example, as 275625 + 386884 = 525^2 + 622^2 .

It is a cyclic number.

It is not a de Polignac number, because 662509 - 2⁵ = 662477 is a prime.

It is a Duffinian number.

662509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662539) 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, 1134 + ... + 1615.

It is an arithmetic number, because the mean of its divisors is an integer number (166375).

2⁶⁶²⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

662509 is a deficient number, since it is larger than the sum of its proper divisors (2991).

662509 is a wasteful number, since it uses less digits than its factorization.

662509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 662509 is about 813.9465584423. The cubic root of 662509 is about 87.1760648192.

The spelling of 662509 in words is "six hundred sixty-two thousand, five hundred nine".