513620354021 has 2 divisors, whose sum is σ = 513620354022. Its totient is φ = 513620354020.

The previous prime is 513620353999. The next prime is 513620354041. The reversal of 513620354021 is 120453026315.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414363851521 + 99256502500 = 643711^2 + 315050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513620354021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513620354041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256810177010 + 256810177011.

It is an arithmetic number, because the mean of its divisors is an integer number (256810177011).

Almost surely, 2^513620354021 is an apocalyptic number.

It is an amenable number.

513620354021 is a deficient number, since it is larger than the sum of its proper divisors (1).

513620354021 is an equidigital number, since it uses as much as digits as its factorization.

513620354021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 513620354021 in words is "five hundred thirteen billion, six hundred twenty million, three hundred fifty-four thousand, twenty-one".