531456661 has 4 divisors (see below), whose sum is σ = 531607212. Its totient is φ = 531306112.

The previous prime is 531456623. The next prime is 531456691. The reversal of 531456661 is 166654135.

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 102718225 + 428738436 = 10135^2 + 20706^2 .

It is a cyclic number.

It is not a de Polignac number, because 531456661 - 2¹¹ = 531454613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531456661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531456691) 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 3 ways as a sum of consecutive naturals, for example, 69850 + ... + 77083.

It is an arithmetic number, because the mean of its divisors is an integer number (132901803).

Almost surely, 2^531456661 is an apocalyptic number.

It is an amenable number.

531456661 is a deficient number, since it is larger than the sum of its proper divisors (150551).

531456661 is a wasteful number, since it uses less digits than its factorization.

531456661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150550.

The product of its digits is 64800, while the sum is 37.

The square root of 531456661 is about 23053.3438138592. The cubic root of 531456661 is about 810.0079565341.

The spelling of 531456661 in words is "five hundred thirty-one million, four hundred fifty-six thousand, six hundred sixty-one".