531818065 has 4 divisors (see below), whose sum is σ = 638181684. Its totient is φ = 425454448.

The previous prime is 531818041. The next prime is 531818083. The reversal of 531818065 is 560818135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146991376 + 384826689 = 12124^2 + 19617^2 .

It is a cyclic number.

It is not a de Polignac number, because 531818065 - 2⁵ = 531818033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53181802 + ... + 53181811.

It is an arithmetic number, because the mean of its divisors is an integer number (159545421).

Almost surely, 2^531818065 is an apocalyptic number.

It is an amenable number.

531818065 is a deficient number, since it is larger than the sum of its proper divisors (106363619).

531818065 is a wasteful number, since it uses less digits than its factorization.

531818065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106363618.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 531818065 is about 23061.1809107860. The cubic root of 531818065 is about 810.1915235774.

The spelling of 531818065 in words is "five hundred thirty-one million, eight hundred eighteen thousand, sixty-five".