513307396921 has 16 divisors (see below), whose sum is σ = 567860477760. Its totient is φ = 460074021120.

The previous prime is 513307396883. The next prime is 513307396949. The reversal of 513307396921 is 129693703315.

It is a cyclic number.

It is not a de Polignac number, because 513307396921 - 2⁷ = 513307396793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513307396981) 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 15 ways as a sum of consecutive naturals, for example, 1992910 + ... + 2235688.

It is an arithmetic number, because the mean of its divisors is an integer number (35491279860).

Almost surely, 2^513307396921 is an apocalyptic number.

It is an amenable number.

513307396921 is a deficient number, since it is larger than the sum of its proper divisors (54553080839).

513307396921 is a wasteful number, since it uses less digits than its factorization.

513307396921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245496.

The product of its (nonzero) digits is 918540, while the sum is 49.

The spelling of 513307396921 in words is "five hundred thirteen billion, three hundred seven million, three hundred ninety-six thousand, nine hundred twenty-one".