513838863893 has 2 divisors, whose sum is σ = 513838863894. Its totient is φ = 513838863892.

The previous prime is 513838863821. The next prime is 513838863899. The reversal of 513838863893 is 398368838315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486725289649 + 27113574244 = 697657^2 + 164662^2 .

It is a cyclic number.

It is not a de Polignac number, because 513838863893 - 2³⁶ = 445119387157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513838863899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256919431946 + 256919431947.

It is an arithmetic number, because the mean of its divisors is an integer number (256919431947).

Almost surely, 2^513838863893 is an apocalyptic number.

It is an amenable number.

513838863893 is a deficient number, since it is larger than the sum of its proper divisors (1).

513838863893 is an equidigital number, since it uses as much as digits as its factorization.

513838863893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89579520, while the sum is 65.

It can be divided in two parts, 513838 and 863893, that added together give a palindrome (1377731).

The spelling of 513838863893 in words is "five hundred thirteen billion, eight hundred thirty-eight million, eight hundred sixty-three thousand, eight hundred ninety-three".