531145 has 8 divisors (see below), whose sum is σ = 671040. Its totient is φ = 402480.

The previous prime is 531143. The next prime is 531163. The reversal of 531145 is 541135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531145 - 2¹ = 531143 is a prime.

It is a super-2 number, since 2×531145² = 564230022050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (531143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2701 + ... + 2890.

It is an arithmetic number, because the mean of its divisors is an integer number (83880).

2⁵³¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

531145 is a deficient number, since it is larger than the sum of its proper divisors (139895).

531145 is a wasteful number, since it uses less digits than its factorization.

531145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615.

The product of its digits is 300, while the sum is 19.

The square root of 531145 is about 728.7969538905. The cubic root of 531145 is about 80.9849588492.

It can be divided in two parts, 5311 and 45, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 531145 in words is "five hundred thirty-one thousand, one hundred forty-five".