531000952561 has 4 divisors (see below), whose sum is σ = 531641485300. Its totient is φ = 530360419824.

The previous prime is 531000952549. The next prime is 531000952579. The reversal of 531000952561 is 165259000135.

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 372290344336 + 158710608225 = 610156^2 + 398385^2 .

It is a cyclic number.

It is not a de Polignac number, because 531000952561 - 2⁹ = 531000952049 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 531000952561.

It is not an unprimeable number, because it can be changed into a prime (531000952591) 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, 320265126 + ... + 320266783.

It is an arithmetic number, because the mean of its divisors is an integer number (132910371325).

Almost surely, 2^531000952561 is an apocalyptic number.

It is an amenable number.

531000952561 is a deficient number, since it is larger than the sum of its proper divisors (640532739).

531000952561 is an equidigital number, since it uses as much as digits as its factorization.

531000952561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640532738.

The product of its (nonzero) digits is 40500, while the sum is 37.

Adding to 531000952561 its reverse (165259000135), we get a palindrome (696259952696).

The spelling of 531000952561 in words is "five hundred thirty-one billion, nine hundred fifty-two thousand, five hundred sixty-one".