511100000009 has 2 divisors, whose sum is σ = 511100000010. Its totient is φ = 511100000008.

The previous prime is 511099999997. The next prime is 511100000083. The reversal of 511100000009 is 900000001115.

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., 324586575625 + 186513424384 = 569725^2 + 431872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511100000009 is a prime.

It is a super-2 number, since 2×511100000009² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511100000909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255550000004 + 255550000005.

It is an arithmetic number, because the mean of its divisors is an integer number (255550000005).

Almost surely, 2^511100000009 is an apocalyptic number.

It is an amenable number.

511100000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

511100000009 is an equidigital number, since it uses as much as digits as its factorization.

511100000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45, while the sum is 17.

The spelling of 511100000009 in words is "five hundred eleven billion, one hundred million, nine", and thus it is an aban number.