513380281 has 2 divisors, whose sum is σ = 513380282. Its totient is φ = 513380280.

The previous prime is 513380279. The next prime is 513380321. The reversal of 513380281 is 182083315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484704256 + 28676025 = 22016^2 + 5355^2 .

It is a cyclic number.

It is not a de Polignac number, because 513380281 - 2¹ = 513380279 is a prime.

It is a super-2 number, since 2×513380281² = 527118625839277922, which contains 22 as substring.

Together with 513380279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (513380381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256690140 + 256690141.

It is an arithmetic number, because the mean of its divisors is an integer number (256690141).

Almost surely, 2^513380281 is an apocalyptic number.

It is an amenable number.

513380281 is a deficient number, since it is larger than the sum of its proper divisors (1).

513380281 is an equidigital number, since it uses as much as digits as its factorization.

513380281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 513380281 is about 22657.8966587810. The cubic root of 513380281 is about 800.7182513050.

The spelling of 513380281 in words is "five hundred thirteen million, three hundred eighty thousand, two hundred eighty-one".