42816649 has 2 divisors, whose sum is σ = 42816650. Its totient is φ = 42816648.

The previous prime is 42816637. The next prime is 42816667. The reversal of 42816649 is 94661824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38975049 + 3841600 = 6243^2 + 1960^2 .

It is a cyclic number.

It is not a de Polignac number, because 42816649 - 2¹³ = 42808457 is a prime.

It is not a weakly prime, because it can be changed into another prime (42816679) 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, 21408324 + 21408325.

It is an arithmetic number, because the mean of its divisors is an integer number (21408325).

Almost surely, 2^42816649 is an apocalyptic number.

It is an amenable number.

42816649 is a deficient number, since it is larger than the sum of its proper divisors (1).

42816649 is an equidigital number, since it uses as much as digits as its factorization.

42816649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 42816649 is about 6543.4432067528. The cubic root of 42816649 is about 349.8411496841.

The spelling of 42816649 in words is "forty-two million, eight hundred sixteen thousand, six hundred forty-nine".