42206249 has 2 divisors, whose sum is σ = 42206250. Its totient is φ = 42206248.

The previous prime is 42206209. The next prime is 42206251. The reversal of 42206249 is 94260224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34140649 + 8065600 = 5843^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 42206249 - 2⁸ = 42205993 is a prime.

It is a Sophie Germain prime.

Together with 42206251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42206209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21103124 + 21103125.

It is an arithmetic number, because the mean of its divisors is an integer number (21103125).

Almost surely, 2^42206249 is an apocalyptic number.

It is an amenable number.

42206249 is a deficient number, since it is larger than the sum of its proper divisors (1).

42206249 is an equidigital number, since it uses as much as digits as its factorization.

42206249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 42206249 is about 6496.6336667539. The cubic root of 42206249 is about 348.1707253419.

The spelling of 42206249 in words is "forty-two million, two hundred six thousand, two hundred forty-nine".