513492781 has 2 divisors, whose sum is σ = 513492782. Its totient is φ = 513492780.

The previous prime is 513492743. The next prime is 513492809. The reversal of 513492781 is 187294315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 513430281 + 62500 = 22659^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 513492781 - 2⁹ = 513492269 is a prime.

It is a super-2 number, since 2×513492781² = 527349672278227922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513492481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256746390 + 256746391.

It is an arithmetic number, because the mean of its divisors is an integer number (256746391).

Almost surely, 2^513492781 is an apocalyptic number.

It is an amenable number.

513492781 is a deficient number, since it is larger than the sum of its proper divisors (1).

513492781 is an equidigital number, since it uses as much as digits as its factorization.

513492781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 513492781 is about 22660.3791009771. The cubic root of 513492781 is about 800.7767357121.

The spelling of 513492781 in words is "five hundred thirteen million, four hundred ninety-two thousand, seven hundred eighty-one".