511521641 has 2 divisors, whose sum is σ = 511521642. Its totient is φ = 511521640.

The previous prime is 511521611. The next prime is 511521683. The reversal of 511521641 is 146125115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294843241 + 216678400 = 17171^2 + 14720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511521641 is a prime.

It is a super-2 number, since 2×511521641² = 523308778422665762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 511521641.

It is not a weakly prime, because it can be changed into another prime (511521601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255760820 + 255760821.

It is an arithmetic number, because the mean of its divisors is an integer number (255760821).

Almost surely, 2^511521641 is an apocalyptic number.

It is an amenable number.

511521641 is a deficient number, since it is larger than the sum of its proper divisors (1).

511521641 is an equidigital number, since it uses as much as digits as its factorization.

511521641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 26.

The square root of 511521641 is about 22616.8441874635. The cubic root of 511521641 is about 799.7507770555.

Adding to 511521641 its reverse (146125115), we get a palindrome (657646756).

The spelling of 511521641 in words is "five hundred eleven million, five hundred twenty-one thousand, six hundred forty-one".