673531 has 4 divisors (see below), whose sum is σ = 709000. Its totient is φ = 638064.

The previous prime is 673529. The next prime is 673549. The reversal of 673531 is 135376.

It is a happy number.

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 673531 - 2¹ = 673529 is a prime.

It is a super-2 number, since 2×673531² = 907288015922, 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 = 673496 and 673505.

It is not an unprimeable number, because it can be changed into a prime (677531) 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, 17706 + ... + 17743.

It is an arithmetic number, because the mean of its divisors is an integer number (177250).

2⁶⁷³⁵³¹ is an apocalyptic number.

673531 is a deficient number, since it is larger than the sum of its proper divisors (35469).

673531 is a wasteful number, since it uses less digits than its factorization.

673531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35468.

The product of its digits is 1890, while the sum is 25.

The square root of 673531 is about 820.6893443929. The cubic root of 673531 is about 87.6568506377.

It can be divided in two parts, 6 and 73531, that added together give a palindrome (73537).

The spelling of 673531 in words is "six hundred seventy-three thousand, five hundred thirty-one".