420545017 has 2 divisors, whose sum is σ = 420545018. Its totient is φ = 420545016.

The previous prime is 420545009. The next prime is 420545023. The reversal of 420545017 is 710545024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420291001 + 254016 = 20501^2 + 504^2 .

It is a cyclic number.

It is not a de Polignac number, because 420545017 - 2³ = 420545009 is a prime.

It is a super-2 number, since 2×420545017² = 353716222647060578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420548017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210272508 + 210272509.

It is an arithmetic number, because the mean of its divisors is an integer number (210272509).

Almost surely, 2^420545017 is an apocalyptic number.

It is an amenable number.

420545017 is a deficient number, since it is larger than the sum of its proper divisors (1).

420545017 is an equidigital number, since it uses as much as digits as its factorization.

420545017 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 28.

The square root of 420545017 is about 20507.1942742053. The cubic root of 420545017 is about 749.2110322568.

The spelling of 420545017 in words is "four hundred twenty million, five hundred forty-five thousand, seventeen".