513787613 has 2 divisors, whose sum is σ = 513787614. Its totient is φ = 513787612.

The previous prime is 513787543. The next prime is 513787619. The reversal of 513787613 is 316787315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511347769 + 2439844 = 22613^2 + 1562^2 .

It is a cyclic number.

It is not a de Polignac number, because 513787613 - 2¹⁰ = 513786589 is a prime.

It is a super-2 number, since 2×513787613² = 527955422544475538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513787619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256893806 + 256893807.

It is an arithmetic number, because the mean of its divisors is an integer number (256893807).

Almost surely, 2^513787613 is an apocalyptic number.

It is an amenable number.

513787613 is a deficient number, since it is larger than the sum of its proper divisors (1).

513787613 is an equidigital number, since it uses as much as digits as its factorization.

513787613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 513787613 is about 22666.8836190598. The cubic root of 513787613 is about 800.9299669704.

The spelling of 513787613 in words is "five hundred thirteen million, seven hundred eighty-seven thousand, six hundred thirteen".