513789721387 has 2 divisors, whose sum is σ = 513789721388. Its totient is φ = 513789721386.

The previous prime is 513789721373. The next prime is 513789721399. The reversal of 513789721387 is 783127987315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513789721387 - 2¹⁵ = 513789688619 is a prime.

It is not a weakly prime, because it can be changed into another prime (513789721087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256894860693 + 256894860694.

It is an arithmetic number, because the mean of its divisors is an integer number (256894860694).

Almost surely, 2^513789721387 is an apocalyptic number.

513789721387 is a deficient number, since it is larger than the sum of its proper divisors (1).

513789721387 is an equidigital number, since it uses as much as digits as its factorization.

513789721387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17781120, while the sum is 61.

The spelling of 513789721387 in words is "five hundred thirteen billion, seven hundred eighty-nine million, seven hundred twenty-one thousand, three hundred eighty-seven".