420128617 has 2 divisors, whose sum is σ = 420128618. Its totient is φ = 420128616.

The previous prime is 420128609. The next prime is 420128663. The reversal of 420128617 is 716821024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419594256 + 534361 = 20484^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 420128617 - 2³ = 420128609 is a prime.

It is a super-3 number, since 3×420128617³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (420128677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210064308 + 210064309.

It is an arithmetic number, because the mean of its divisors is an integer number (210064309).

Almost surely, 2^420128617 is an apocalyptic number.

It is an amenable number.

420128617 is a deficient number, since it is larger than the sum of its proper divisors (1).

420128617 is an equidigital number, since it uses as much as digits as its factorization.

420128617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 420128617 is about 20497.0392252149. The cubic root of 420128617 is about 748.9636750708.

The spelling of 420128617 in words is "four hundred twenty million, one hundred twenty-eight thousand, six hundred seventeen".