420142109 has 2 divisors, whose sum is σ = 420142110. Its totient is φ = 420142108.

The previous prime is 420142103. The next prime is 420142139. The reversal of 420142109 is 901241024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334524100 + 85618009 = 18290^2 + 9253^2 .

It is a cyclic number.

It is not a de Polignac number, because 420142109 - 2²⁴ = 403364893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420142103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210071054 + 210071055.

It is an arithmetic number, because the mean of its divisors is an integer number (210071055).

Almost surely, 2^420142109 is an apocalyptic number.

It is an amenable number.

420142109 is a deficient number, since it is larger than the sum of its proper divisors (1).

420142109 is an equidigital number, since it uses as much as digits as its factorization.

420142109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 420142109 is about 20497.3683432776. The cubic root of 420142109 is about 748.9716923853.

The spelling of 420142109 in words is "four hundred twenty million, one hundred forty-two thousand, one hundred nine".