511221013 has 2 divisors, whose sum is σ = 511221014. Its totient is φ = 511221012.

The previous prime is 511221001. The next prime is 511221041. The reversal of 511221013 is 310122115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284327044 + 226893969 = 16862^2 + 15063^2 .

It is a cyclic number.

It is not a de Polignac number, because 511221013 - 2⁵ = 511220981 is a prime.

It is a super-2 number, since 2×511221013² = 522693848265492338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511221083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255610506 + 255610507.

It is an arithmetic number, because the mean of its divisors is an integer number (255610507).

Almost surely, 2^511221013 is an apocalyptic number.

It is an amenable number.

511221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

511221013 is an equidigital number, since it uses as much as digits as its factorization.

511221013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 511221013 is about 22610.1971021926. The cubic root of 511221013 is about 799.5940716667.

Adding to 511221013 its reverse (310122115), we get a palindrome (821343128).

The spelling of 511221013 in words is "five hundred eleven million, two hundred twenty-one thousand, thirteen".