42182209 has 2 divisors, whose sum is σ = 42182210. Its totient is φ = 42182208.

The previous prime is 42182123. The next prime is 42182213. The reversal of 42182209 is 90228124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36869184 + 5313025 = 6072^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 42182209 - 2⁷ = 42182081 is a prime.

It is a super-2 number, since 2×42182209² = 3558677512239362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42182279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21091104 + 21091105.

It is an arithmetic number, because the mean of its divisors is an integer number (21091105).

Almost surely, 2^42182209 is an apocalyptic number.

It is an amenable number.

42182209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42182209 is an equidigital number, since it uses as much as digits as its factorization.

42182209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 42182209 is about 6494.7832142420. The cubic root of 42182209 is about 348.1046086405.

The spelling of 42182209 in words is "forty-two million, one hundred eighty-two thousand, two hundred nine".