513143021 has 4 divisors (see below), whose sum is σ = 513306432. Its totient is φ = 512979612.

The previous prime is 513142991. The next prime is 513143027. The reversal of 513143021 is 120341315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120341315 = 5 ⋅24068263.

It is a cyclic number.

It is not a de Polignac number, because 513143021 - 2⁶ = 513142957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513142984 and 513143002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513143027) 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, 76901 + ... + 83306.

It is an arithmetic number, because the mean of its divisors is an integer number (128326608).

Almost surely, 2^513143021 is an apocalyptic number.

It is an amenable number.

513143021 is a deficient number, since it is larger than the sum of its proper divisors (163411).

513143021 is a wasteful number, since it uses less digits than its factorization.

513143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163410.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 513143021 is about 22652.6603514907. The cubic root of 513143021 is about 800.5948809736.

Adding to 513143021 its reverse (120341315), we get a palindrome (633484336).

The spelling of 513143021 in words is "five hundred thirteen million, one hundred forty-three thousand, twenty-one".