513816893 has 2 divisors, whose sum is σ = 513816894. Its totient is φ = 513816892.

The previous prime is 513816881. The next prime is 513816907. The reversal of 513816893 is 398618315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 482153764 + 31663129 = 21958^2 + 5627^2 .

It is a cyclic number.

It is not a de Polignac number, because 513816893 - 2⁸ = 513816637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513816833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256908446 + 256908447.

It is an arithmetic number, because the mean of its divisors is an integer number (256908447).

Almost surely, 2^513816893 is an apocalyptic number.

It is an amenable number.

513816893 is a deficient number, since it is larger than the sum of its proper divisors (1).

513816893 is an equidigital number, since it uses as much as digits as its factorization.

513816893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 513816893 is about 22667.5294860291. The cubic root of 513816893 is about 800.9451812881.

The spelling of 513816893 in words is "five hundred thirteen million, eight hundred sixteen thousand, eight hundred ninety-three".