42216989 has 2 divisors, whose sum is σ = 42216990. Its totient is φ = 42216988.

The previous prime is 42216973. The next prime is 42217039. The reversal of 42216989 is 98961224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41705764 + 511225 = 6458^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 42216989 - 2⁴ = 42216973 is a prime.

It is a super-2 number, since 2×42216989² = 3564548320452242, which contains 22 as substring.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21108494 + 21108495.

It is an arithmetic number, because the mean of its divisors is an integer number (21108495).

Almost surely, 2^42216989 is an apocalyptic number.

It is an amenable number.

42216989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42216989 is an equidigital number, since it uses as much as digits as its factorization.

42216989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 42216989 is about 6497.4601961074. The cubic root of 42216989 is about 348.2002552223.

The spelling of 42216989 in words is "forty-two million, two hundred sixteen thousand, nine hundred eighty-nine".