42170449 has 2 divisors, whose sum is σ = 42170450. Its totient is φ = 42170448.

The previous prime is 42170407. The next prime is 42170461. The reversal of 42170449 is 94407124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29160000 + 13010449 = 5400^2 + 3607^2 .

It is a cyclic number.

It is not a de Polignac number, because 42170449 - 2⁹ = 42169937 is a prime.

It is equal to p_2557345 and since 42170449 and 2557345 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42170449.

It is not a weakly prime, because it can be changed into another prime (42171449) 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, 21085224 + 21085225.

It is an arithmetic number, because the mean of its divisors is an integer number (21085225).

Almost surely, 2^42170449 is an apocalyptic number.

It is an amenable number.

42170449 is a deficient number, since it is larger than the sum of its proper divisors (1).

42170449 is an equidigital number, since it uses as much as digits as its factorization.

42170449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 42170449 is about 6493.8778091368. The cubic root of 42170449 is about 348.0722562121.

The spelling of 42170449 in words is "forty-two million, one hundred seventy thousand, four hundred forty-nine".