42451817 has 2 divisors, whose sum is σ = 42451818. Its totient is φ = 42451816.

The previous prime is 42451807. The next prime is 42451831. The reversal of 42451817 is 71815424.

It is a happy number.

42451817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32535616 + 9916201 = 5704^2 + 3149^2 .

It is a cyclic number.

It is not a de Polignac number, because 42451817 - 2⁸ = 42451561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42451807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225908 + 21225909.

It is an arithmetic number, because the mean of its divisors is an integer number (21225909).

Almost surely, 2^42451817 is an apocalyptic number.

It is an amenable number.

42451817 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451817 is an equidigital number, since it uses as much as digits as its factorization.

42451817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 42451817 is about 6515.5058897986. The cubic root of 42451817 is about 348.8446721649.

The spelling of 42451817 in words is "forty-two million, four hundred fifty-one thousand, eight hundred seventeen".