513021123 has 6 divisors (see below), whose sum is σ = 741030524. Its totient is φ = 342014076.

The previous prime is 513021101. The next prime is 513021137. The reversal of 513021123 is 321120315.

It is not a de Polignac number, because 513021123 - 2⁶ = 513021059 is a prime.

It is a super-2 number, since 2×513021123² = 526381345288362258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513021096 and 513021105.

It is not an unprimeable number, because it can be changed into a prime (513021193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28501165 + ... + 28501182.

Almost surely, 2^513021123 is an apocalyptic number.

513021123 is a deficient number, since it is larger than the sum of its proper divisors (228009401).

513021123 is a wasteful number, since it uses less digits than its factorization.

513021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57002353 (or 57002350 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 513021123 is about 22649.9696026286. The cubic root of 513021123 is about 800.5314817266.

Adding to 513021123 its reverse (321120315), we get a palindrome (834141438).

It can be divided in two parts, 51302 and 1123, that added together give a palindrome (52425).

The spelling of 513021123 in words is "five hundred thirteen million, twenty-one thousand, one hundred twenty-three".