513223521 has 8 divisors (see below), whose sum is σ = 691073664. Its totient is φ = 338761200.

The previous prime is 513223499. The next prime is 513223531. The reversal of 513223521 is 125322315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 513223521 - 2⁶ = 513223457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 513223491 and 513223500.

It is not an unprimeable number, because it can be changed into a prime (513223531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846601 + ... + 847206.

It is an arithmetic number, because the mean of its divisors is an integer number (86384208).

Almost surely, 2^513223521 is an apocalyptic number.

It is an amenable number.

513223521 is a deficient number, since it is larger than the sum of its proper divisors (177850143).

513223521 is a wasteful number, since it uses less digits than its factorization.

513223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693911.

The product of its digits is 1800, while the sum is 24.

The square root of 513223521 is about 22654.4371150554. The cubic root of 513223521 is about 800.6367435834.

Adding to 513223521 its reverse (125322315), we get a palindrome (638545836).

The spelling of 513223521 in words is "five hundred thirteen million, two hundred twenty-three thousand, five hundred twenty-one".