531665 has 8 divisors (see below), whose sum is σ = 644328. Its totient is φ = 421120.

The previous prime is 531637. The next prime is 531667. The reversal of 531665 is 566135.

It can be written as a sum of positive squares in 4 ways, for example, as 1681 + 529984 = 41^2 + 728^2 .

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

It is not a de Polignac number, because 531665 - 2¹⁰ = 530641 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (531667) 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, 95 + ... + 1035.

It is an arithmetic number, because the mean of its divisors is an integer number (80541).

2⁵³¹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

531665 is a deficient number, since it is larger than the sum of its proper divisors (112663).

531665 is a wasteful number, since it uses less digits than its factorization.

531665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059.

The product of its digits is 2700, while the sum is 26.

The square root of 531665 is about 729.1536189309. The cubic root of 531665 is about 81.0113787805.

The spelling of 531665 in words is "five hundred thirty-one thousand, six hundred sixty-five".