531732661 has 8 divisors (see below), whose sum is σ = 564936120. Its totient is φ = 499520448.

The previous prime is 531732601. The next prime is 531732679. The reversal of 531732661 is 166237135.

It can be written as a sum of positive squares in 4 ways, for example, as 38626225 + 493106436 = 6215^2 + 22206^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 531732661 - 2¹³ = 531724469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531732601) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 246706 + ... + 248851.

It is an arithmetic number, because the mean of its divisors is an integer number (70617015).

Almost surely, 2^531732661 is an apocalyptic number.

It is an amenable number.

531732661 is a deficient number, since it is larger than the sum of its proper divisors (33203459).

531732661 is a wasteful number, since it uses less digits than its factorization.

531732661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495623.

The product of its digits is 22680, while the sum is 34.

The square root of 531732661 is about 23059.3291532950. The cubic root of 531732661 is about 810.1481520401.

Adding to 531732661 its reverse (166237135), we get a palindrome (697969796).

The spelling of 531732661 in words is "five hundred thirty-one million, seven hundred thirty-two thousand, six hundred sixty-one".