511212109 has 2 divisors, whose sum is σ = 511212110. Its totient is φ = 511212108.

The previous prime is 511212061. The next prime is 511212131. The reversal of 511212109 is 901212115.

It is an a-pointer prime, because the next prime (511212131) can be obtained adding 511212109 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511212100 + 9 = 22610^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 511212109 - 2¹¹ = 511210061 is a prime.

It is a super-2 number, since 2×511212109² = 522675640776455762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 511212109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511212139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255606054 + 255606055.

It is an arithmetic number, because the mean of its divisors is an integer number (255606055).

Almost surely, 2^511212109 is an apocalyptic number.

It is an amenable number.

511212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

511212109 is an equidigital number, since it uses as much as digits as its factorization.

511212109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 511212109 is about 22610.0001990270. Note that the first 3 decimals coincide. The cubic root of 511212109 is about 799.5894294300.

The spelling of 511212109 in words is "five hundred eleven million, two hundred twelve thousand, one hundred nine".