654523 has 4 divisors (see below), whose sum is σ = 664360. Its totient is φ = 644688.

The previous prime is 654509. The next prime is 654527. The reversal of 654523 is 325456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654523 - 2⁵ = 654491 is a prime.

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

It is a Duffinian number.

654523 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (654527) 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, 4818 + ... + 4951.

It is an arithmetic number, because the mean of its divisors is an integer number (166090).

2⁶⁵⁴⁵²³ is an apocalyptic number.

654523 is a deficient number, since it is larger than the sum of its proper divisors (9837).

654523 is an equidigital number, since it uses as much as digits as its factorization.

654523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9836.

The product of its digits is 3600, while the sum is 25.

The square root of 654523 is about 809.0259575564. The cubic root of 654523 is about 86.8243693389.

Adding to 654523 its reverse (325456), we get a palindrome (979979).

The spelling of 654523 in words is "six hundred fifty-four thousand, five hundred twenty-three".