513005421 has 4 divisors (see below), whose sum is σ = 684007232. Its totient is φ = 342003612.

The previous prime is 513005417. The next prime is 513005431. The reversal of 513005421 is 124500315.

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.

It is not a de Polignac number, because 513005421 - 2² = 513005417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513005431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85500901 + ... + 85500906.

It is an arithmetic number, because the mean of its divisors is an integer number (171001808).

Almost surely, 2^513005421 is an apocalyptic number.

It is an amenable number.

513005421 is a deficient number, since it is larger than the sum of its proper divisors (171001811).

513005421 is a wasteful number, since it uses less digits than its factorization.

513005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171001810.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 513005421 is about 22649.6229769946. The cubic root of 513005421 is about 800.5233143738.

Adding to 513005421 its reverse (124500315), we get a palindrome (637505736).

The spelling of 513005421 in words is "five hundred thirteen million, five thousand, four hundred twenty-one".