531664261 has 4 divisors (see below), whose sum is σ = 544631724. Its totient is φ = 518696800.

The previous prime is 531664249. The next prime is 531664313. The reversal of 531664261 is 162466135.

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 90916225 + 440748036 = 9535^2 + 20994^2 .

It is a cyclic number.

It is not a de Polignac number, because 531664261 - 2²¹ = 529567109 is a prime.

It is a super-2 number, since 2×531664261² = 565333772849352242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531664201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6483670 + ... + 6483751.

It is an arithmetic number, because the mean of its divisors is an integer number (136157931).

Almost surely, 2^531664261 is an apocalyptic number.

It is an amenable number.

531664261 is a deficient number, since it is larger than the sum of its proper divisors (12967463).

531664261 is a wasteful number, since it uses less digits than its factorization.

531664261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12967462.

The product of its digits is 25920, while the sum is 34.

The square root of 531664261 is about 23057.8459748520. The cubic root of 531664261 is about 810.1134124589.

The spelling of 531664261 in words is "five hundred thirty-one million, six hundred sixty-four thousand, two hundred sixty-one".