513161521 has 4 divisors (see below), whose sum is σ = 513221632. Its totient is φ = 513101412.

The previous prime is 513161483. The next prime is 513161543. The reversal of 513161521 is 125161315.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 513161521 - 2⁷ = 513161393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513161581) 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, 14601 + ... + 35206.

It is an arithmetic number, because the mean of its divisors is an integer number (128305408).

Almost surely, 2^513161521 is an apocalyptic number.

It is an amenable number.

513161521 is a deficient number, since it is larger than the sum of its proper divisors (60111).

513161521 is a wasteful number, since it uses less digits than its factorization.

513161521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60110.

The product of its digits is 900, while the sum is 25.

The square root of 513161521 is about 22653.0686883698. The cubic root of 513161521 is about 800.6045019608.

The spelling of 513161521 in words is "five hundred thirteen million, one hundred sixty-one thousand, five hundred twenty-one".