531018 has 12 divisors (see below), whose sum is σ = 1150578. Its totient is φ = 177000.

The previous prime is 531017. The next prime is 531023. The reversal of 531018 is 810135.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 59049 = 687^2 + 243^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 29501 = 531018 / (5 + 3 + 1 + 0 + 1 + 8).

It is not an unprimeable number, because it can be changed into a prime (531017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14733 + ... + 14768.

2⁵³¹⁰¹⁸ is an apocalyptic number.

531018 is an abundant number, since it is smaller than the sum of its proper divisors (619560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531018 is a wasteful number, since it uses less digits than its factorization.

531018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29509 (or 29506 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 531018 is about 728.7098187893. The cubic root of 531018 is about 80.9785036692.

The spelling of 531018 in words is "five hundred thirty-one thousand, eighteen".