531081 has 6 divisors (see below), whose sum is σ = 767130. Its totient is φ = 354048.

The previous prime is 531079. The next prime is 531101. The reversal of 531081 is 180135.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 95481 = 660^2 + 309^2 .

It is not a de Polignac number, because 531081 - 2¹ = 531079 is a prime.

It is a super-2 number, since 2×531081² = 564094057122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (531071) 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, 29496 + ... + 29513.

It is an arithmetic number, because the mean of its divisors is an integer number (127855).

2⁵³¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

531081 is a deficient number, since it is larger than the sum of its proper divisors (236049).

531081 is a wasteful number, since it uses less digits than its factorization.

531081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59015 (or 59012 counting only the distinct ones).

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

The square root of 531081 is about 728.7530445906. The cubic root of 531081 is about 80.9817059737.

The spelling of 531081 in words is "five hundred thirty-one thousand, eighty-one".