531403 has 4 divisors (see below), whose sum is σ = 562680. Its totient is φ = 500128.

The previous prime is 531383. The next prime is 531457. The reversal of 531403 is 304135.

531403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 531403 - 2¹⁷ = 400331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531103) 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, 15613 + ... + 15646.

It is an arithmetic number, because the mean of its divisors is an integer number (140670).

2⁵³¹⁴⁰³ is an apocalyptic number.

531403 is a deficient number, since it is larger than the sum of its proper divisors (31277).

531403 is a wasteful number, since it uses less digits than its factorization.

531403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31276.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 531403 is about 728.9739364339. The cubic root of 531403 is about 80.9980693540.

Adding to 531403 its reverse (304135), we get a palindrome (835538).

The spelling of 531403 in words is "five hundred thirty-one thousand, four hundred three".