510505421 has 2 divisors, whose sum is σ = 510505422. Its totient is φ = 510505420.

The previous prime is 510505397. The next prime is 510505469. The reversal of 510505421 is 124505015.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468073225 + 42432196 = 21635^2 + 6514^2 .

It is a cyclic number.

It is not a de Polignac number, because 510505421 - 2¹⁸ = 510243277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (510505321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255252710 + 255252711.

It is an arithmetic number, because the mean of its divisors is an integer number (255252711).

Almost surely, 2^510505421 is an apocalyptic number.

It is an amenable number.

510505421 is a deficient number, since it is larger than the sum of its proper divisors (1).

510505421 is an equidigital number, since it uses as much as digits as its factorization.

510505421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 510505421 is about 22594.3670192373. The cubic root of 510505421 is about 799.2208147719.

The spelling of 510505421 in words is "five hundred ten million, five hundred five thousand, four hundred twenty-one".