65436221 has 2 divisors, whose sum is σ = 65436222. Its totient is φ = 65436220.

The previous prime is 65436211. The next prime is 65436229. The reversal of 65436221 is 12263456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48511225 + 16924996 = 6965^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 65436221 - 2⁶ = 65436157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65436229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32718110 + 32718111.

It is an arithmetic number, because the mean of its divisors is an integer number (32718111).

Almost surely, 2^65436221 is an apocalyptic number.

It is an amenable number.

65436221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65436221 is an equidigital number, since it uses as much as digits as its factorization.

65436221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 65436221 is about 8089.2657886856. The cubic root of 65436221 is about 402.9700199566.

Adding to 65436221 its reverse (12263456), we get a palindrome (77699677).

The spelling of 65436221 in words is "sixty-five million, four hundred thirty-six thousand, two hundred twenty-one".