42216949 has 2 divisors, whose sum is σ = 42216950. Its totient is φ = 42216948.

The previous prime is 42216931. The next prime is 42216973. The reversal of 42216949 is 94961224.

It is a happy number.

42216949 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., 30724849 + 11492100 = 5543^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 42216949 - 2⁷ = 42216821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42216929) 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, 21108474 + 21108475.

It is an arithmetic number, because the mean of its divisors is an integer number (21108475).

Almost surely, 2^42216949 is an apocalyptic number.

It is an amenable number.

42216949 is a deficient number, since it is larger than the sum of its proper divisors (1).

42216949 is an equidigital number, since it uses as much as digits as its factorization.

42216949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 42216949 is about 6497.4571179808. The cubic root of 42216949 is about 348.2001452506.

It can be divided in two parts, 422 and 16949, that added together give a palindrome (17371).

The spelling of 42216949 in words is "forty-two million, two hundred sixteen thousand, nine hundred forty-nine".