673531613 has 4 divisors (see below), whose sum is σ = 673792380. Its totient is φ = 673270848.

The previous prime is 673531597. The next prime is 673531633. The reversal of 673531613 is 316135376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 272811289 + 400720324 = 16517^2 + 20018^2 .

It is a cyclic number.

It is not a de Polignac number, because 673531613 - 2⁴ = 673531597 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 (673531633) 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, 126470 + ... + 131687.

It is an arithmetic number, because the mean of its divisors is an integer number (168448095).

Almost surely, 2^673531613 is an apocalyptic number.

It is an amenable number.

673531613 is a deficient number, since it is larger than the sum of its proper divisors (260767).

673531613 is a wasteful number, since it uses less digits than its factorization.

673531613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260766.

The product of its digits is 34020, while the sum is 35.

The square root of 673531613 is about 25952.4876071640. The cubic root of 673531613 is about 876.5687723067.

Adding to 673531613 its reverse (316135376), we get a palindrome (989666989).

The spelling of 673531613 in words is "six hundred seventy-three million, five hundred thirty-one thousand, six hundred thirteen".