511431341521 has 2 divisors, whose sum is σ = 511431341522. Its totient is φ = 511431341520.

The previous prime is 511431341507. The next prime is 511431341581. The reversal of 511431341521 is 125143134115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467806753296 + 43624588225 = 683964^2 + 208865^2 .

It is a cyclic number.

It is not a de Polignac number, because 511431341521 - 2⁵ = 511431341489 is a prime.

It is not a weakly prime, because it can be changed into another prime (511431341581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255715670760 + 255715670761.

It is an arithmetic number, because the mean of its divisors is an integer number (255715670761).

Almost surely, 2^511431341521 is an apocalyptic number.

It is an amenable number.

511431341521 is a deficient number, since it is larger than the sum of its proper divisors (1).

511431341521 is an equidigital number, since it uses as much as digits as its factorization.

511431341521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

Adding to 511431341521 its reverse (125143134115), we get a palindrome (636574475636).

The spelling of 511431341521 in words is "five hundred eleven billion, four hundred thirty-one million, three hundred forty-one thousand, five hundred twenty-one".