30531 has 4 divisors (see below), whose sum is σ = 40712.
Its totient is φ = 20352.
The previous prime is 30529. The next prime is 30539. The reversal of 30531 is 13503.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 30531 - 21 = 30529 is a prime.
It is a super-2 number, since 2×305312 = 1864283922, which contains 22 as substring.
It is a D-number.
It is a Duffinian number.
It is a nialpdrome in base 16.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (30539) 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, 5086 + ... + 5091.
It is an arithmetic number, because the mean of its divisors is an integer number (10178).
230531 is an apocalyptic number.
30531 is a deficient number, since it is larger than the sum of its proper divisors (10181).
30531 is a wasteful number, since it uses less digits than its factorization.
30531 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10180.
The product of its (nonzero) digits is 45, while the sum is 12.
The square root of 30531 is about 174.7312221671.
The cubic root of 30531 is about 31.2545806619.
It can be divided in two parts, 30 and 531, that added together give a triangular number (561 = T33).
The spelling of 30531 in words is "thirty thousand, five hundred thirty-one".