513947734621 has 4 divisors (see below), whose sum is σ = 513954413152. Its totient is φ = 513941056092.

The previous prime is 513947734609. The next prime is 513947734631. The reversal of 513947734621 is 126437749315.

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 a cyclic number.

It is not a de Polignac number, because 513947734621 - 2⁵ = 513947734589 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 (513947734631) 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, 3222471 + ... + 3378196.

It is an arithmetic number, because the mean of its divisors is an integer number (128488603288).

Almost surely, 2^513947734621 is an apocalyptic number.

It is an amenable number.

513947734621 is a deficient number, since it is larger than the sum of its proper divisors (6678531).

513947734621 is an equidigital number, since it uses as much as digits as its factorization.

513947734621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678530.

The product of its digits is 3810240, while the sum is 52.

The spelling of 513947734621 in words is "five hundred thirteen billion, nine hundred forty-seven million, seven hundred thirty-four thousand, six hundred twenty-one".