511321111123 has 4 divisors (see below), whose sum is σ = 541398823560. Its totient is φ = 481243398688.

The previous prime is 511321111109. The next prime is 511321111139. The reversal of 511321111123 is 321111123115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 511321111123 - 2¹³ = 511321102931 is a prime.

It is a super-2 number, since 2×511321111123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 511321111094 and 511321111103.

It is not an unprimeable number, because it can be changed into a prime (511321111193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15038856193 + ... + 15038856226.

It is an arithmetic number, because the mean of its divisors is an integer number (135349705890).

Almost surely, 2^511321111123 is an apocalyptic number.

511321111123 is a deficient number, since it is larger than the sum of its proper divisors (30077712437).

511321111123 is a wasteful number, since it uses less digits than its factorization.

511321111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30077712436.

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

Adding to 511321111123 its reverse (321111123115), we get a palindrome (832432234238).

The spelling of 511321111123 in words is "five hundred eleven billion, three hundred twenty-one million, one hundred eleven thousand, one hundred twenty-three".