515343421 has 2 divisors, whose sum is σ = 515343422. Its totient is φ = 515343420.

The previous prime is 515343419. The next prime is 515343461. The reversal of 515343421 is 124343515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513520921 + 1822500 = 22661^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 515343421 - 2¹ = 515343419 is a prime.

Together with 515343419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 515343421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515343461) 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, 257671710 + 257671711.

It is an arithmetic number, because the mean of its divisors is an integer number (257671711).

Almost surely, 2^515343421 is an apocalyptic number.

It is an amenable number.

515343421 is a deficient number, since it is larger than the sum of its proper divisors (1).

515343421 is an equidigital number, since it uses as much as digits as its factorization.

515343421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 515343421 is about 22701.1766435134. The cubic root of 515343421 is about 801.7375883552.

Adding to 515343421 its reverse (124343515), we get a palindrome (639686936).

The spelling of 515343421 in words is "five hundred fifteen million, three hundred forty-three thousand, four hundred twenty-one".