513018421 has 2 divisors, whose sum is σ = 513018422. Its totient is φ = 513018420.

The previous prime is 513018409. The next prime is 513018461. The reversal of 513018421 is 124810315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476548900 + 36469521 = 21830^2 + 6039^2 .

It is a cyclic number.

It is not a de Polignac number, because 513018421 - 2⁷ = 513018293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513018461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256509210 + 256509211.

It is an arithmetic number, because the mean of its divisors is an integer number (256509211).

Almost surely, 2^513018421 is an apocalyptic number.

It is an amenable number.

513018421 is a deficient number, since it is larger than the sum of its proper divisors (1).

513018421 is an equidigital number, since it uses as much as digits as its factorization.

513018421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 513018421 is about 22649.9099556709. The cubic root of 513018421 is about 800.5300763005.

Adding to 513018421 its reverse (124810315), we get a palindrome (637828736).

The spelling of 513018421 in words is "five hundred thirteen million, eighteen thousand, four hundred twenty-one".