420128129 has 2 divisors, whose sum is σ = 420128130. Its totient is φ = 420128128.

The previous prime is 420128119. The next prime is 420128147. The reversal of 420128129 is 921821024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406103104 + 14025025 = 20152^2 + 3745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420128129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420128119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210064064 + 210064065.

It is an arithmetic number, because the mean of its divisors is an integer number (210064065).

Almost surely, 2^420128129 is an apocalyptic number.

It is an amenable number.

420128129 is a deficient number, since it is larger than the sum of its proper divisors (1).

420128129 is an equidigital number, since it uses as much as digits as its factorization.

420128129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 420128129 is about 20497.0273210532. The cubic root of 420128129 is about 748.9633850846.

The spelling of 420128129 in words is "four hundred twenty million, one hundred twenty-eight thousand, one hundred twenty-nine".