523613 has 4 divisors (see below), whose sum is σ = 527520. Its totient is φ = 519708.

The previous prime is 523603. The next prime is 523631. The reversal of 523613 is 316325.

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 not a de Polignac number, because 523613 - 2⁴ = 523597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523603) 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, 1745 + ... + 2022.

It is an arithmetic number, because the mean of its divisors is an integer number (131880).

2⁵²³⁶¹³ is an apocalyptic number.

It is an amenable number.

523613 is a deficient number, since it is larger than the sum of its proper divisors (3907).

523613 is a wasteful number, since it uses less digits than its factorization.

523613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906.

The product of its digits is 540, while the sum is 20.

The square root of 523613 is about 723.6110833866. The cubic root of 523613 is about 80.6003275667.

Adding to 523613 its reverse (316325), we get a palindrome (839938).

The spelling of 523613 in words is "five hundred twenty-three thousand, six hundred thirteen".