517045421 has 2 divisors, whose sum is σ = 517045422. Its totient is φ = 517045420.

The previous prime is 517045393. The next prime is 517045433. The reversal of 517045421 is 124540715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493328521 + 23716900 = 22211^2 + 4870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-517045421 is a prime.

It is a Chen prime.

It is equal to p_27205265 and since 517045421 and 27205265 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517045471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258522710 + 258522711.

It is an arithmetic number, because the mean of its divisors is an integer number (258522711).

Almost surely, 2^517045421 is an apocalyptic number.

It is an amenable number.

517045421 is a deficient number, since it is larger than the sum of its proper divisors (1).

517045421 is an equidigital number, since it uses as much as digits as its factorization.

517045421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 517045421 is about 22738.6327865156. The cubic root of 517045421 is about 802.6192385653.

The spelling of 517045421 in words is "five hundred seventeen million, forty-five thousand, four hundred twenty-one".