513143681 has 2 divisors, whose sum is σ = 513143682. Its totient is φ = 513143680.

The previous prime is 513143671. The next prime is 513143693. The reversal of 513143681 is 186341315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469372225 + 43771456 = 21665^2 + 6616^2 .

It is a cyclic number.

It is not a de Polignac number, because 513143681 - 2²⁶ = 446034817 is a prime.

It is a super-2 number, since 2×513143681² = 526632874700459522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (513143611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256571840 + 256571841.

It is an arithmetic number, because the mean of its divisors is an integer number (256571841).

Almost surely, 2^513143681 is an apocalyptic number.

It is an amenable number.

513143681 is a deficient number, since it is larger than the sum of its proper divisors (1).

513143681 is an equidigital number, since it uses as much as digits as its factorization.

513143681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 513143681 is about 22652.6749193114. The cubic root of 513143681 is about 800.5952242128.

Adding to 513143681 its reverse (186341315), we get a palindrome (699484996).

The spelling of 513143681 in words is "five hundred thirteen million, one hundred forty-three thousand, six hundred eighty-one".