613531 has 4 divisors (see below), whose sum is σ = 615600. Its totient is φ = 611464.

The previous prime is 613523. The next prime is 613549. The reversal of 613531 is 135316.

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 613531 - 2³ = 613523 is a prime.

It is a super-2 number, since 2×613531² = 752840575922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 613499 and 613508.

It is not an unprimeable number, because it can be changed into a prime (613231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (153900).

2⁶¹³⁵³¹ is an apocalyptic number.

613531 is a deficient number, since it is larger than the sum of its proper divisors (2069).

613531 is a wasteful number, since it uses less digits than its factorization.

613531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068.

The product of its digits is 270, while the sum is 19.

The square root of 613531 is about 783.2821969125. The cubic root of 613531 is about 84.9725863154.

Adding to 613531 its reverse (135316), we get a palindrome (748847).

The spelling of 613531 in words is "six hundred thirteen thousand, five hundred thirty-one".