511000000123 has 2 divisors, whose sum is σ = 511000000124. Its totient is φ = 511000000122.

The previous prime is 511000000079. The next prime is 511000000139. The reversal of 511000000123 is 321000000115.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511000000123 is a prime.

It is a super-2 number, since 2×511000000123² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511000003123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255500000061 + 255500000062.

It is an arithmetic number, because the mean of its divisors is an integer number (255500000062).

Almost surely, 2^511000000123 is an apocalyptic number.

511000000123 is a deficient number, since it is larger than the sum of its proper divisors (1).

511000000123 is an equidigital number, since it uses as much as digits as its factorization.

511000000123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 13.

Adding to 511000000123 its reverse (321000000115), we get a palindrome (832000000238).

The spelling of 511000000123 in words is "five hundred eleven billion, one hundred twenty-three", and thus it is an aban number.