42090017 has 2 divisors, whose sum is σ = 42090018. Its totient is φ = 42090016.

The previous prime is 42089963. The next prime is 42090029. The reversal of 42090017 is 71009024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29986576 + 12103441 = 5476^2 + 3479^2 .

It is a cyclic number.

It is not a de Polignac number, because 42090017 - 2²² = 37895713 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42089974 and 42090001.

It is not a weakly prime, because it can be changed into another prime (42096017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045008 + 21045009.

It is an arithmetic number, because the mean of its divisors is an integer number (21045009).

Almost surely, 2^42090017 is an apocalyptic number.

It is an amenable number.

42090017 is a deficient number, since it is larger than the sum of its proper divisors (1).

42090017 is an equidigital number, since it uses as much as digits as its factorization.

42090017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 42090017 is about 6487.6819434988. The cubic root of 42090017 is about 347.8508218006.

The spelling of 42090017 in words is "forty-two million, ninety thousand, seventeen".