648569 has 4 divisors (see below), whose sum is σ = 663696. Its totient is φ = 633444.

The previous prime is 648563. The next prime is 648607. The reversal of 648569 is 965846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648569 is a prime.

It is a super-2 number, since 2×648569² = 841283495522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648563) 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, 7499 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (165924).

648569 is a Friedman number, since it can be written as 9^6+8*(6+5)^4, using all its digits and the basic arithmetic operations.

2⁶⁴⁸⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

648569 is a deficient number, since it is larger than the sum of its proper divisors (15127).

648569 is a wasteful number, since it uses less digits than its factorization.

648569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15126.

The product of its digits is 51840, while the sum is 38.

The square root of 648569 is about 805.3378173164. The cubic root of 648569 is about 86.5602952038.

The spelling of 648569 in words is "six hundred forty-eight thousand, five hundred sixty-nine".