215422481 has 2 divisors, whose sum is σ = 215422482. Its totient is φ = 215422480.

The previous prime is 215422451. The next prime is 215422549. The reversal of 215422481 is 184224512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206180881 + 9241600 = 14359^2 + 3040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215422481 is a prime.

It is a super-2 number, since 2×215422481² = 92813690640390722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215422421) 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, 107711240 + 107711241.

It is an arithmetic number, because the mean of its divisors is an integer number (107711241).

Almost surely, 2^215422481 is an apocalyptic number.

It is an amenable number.

215422481 is a deficient number, since it is larger than the sum of its proper divisors (1).

215422481 is an equidigital number, since it uses as much as digits as its factorization.

215422481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 29.

The square root of 215422481 is about 14677.2777108018. The cubic root of 215422481 is about 599.4647828982.

Adding to 215422481 its reverse (184224512), we get a palindrome (399646993).

The spelling of 215422481 in words is "two hundred fifteen million, four hundred twenty-two thousand, four hundred eighty-one".