85433221 has 2 divisors, whose sum is σ = 85433222. Its totient is φ = 85433220.

The previous prime is 85433137. The next prime is 85433237. The reversal of 85433221 is 12233458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84382596 + 1050625 = 9186^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 85433221 - 2⁹ = 85432709 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 85433221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85433261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42716610 + 42716611.

It is an arithmetic number, because the mean of its divisors is an integer number (42716611).

Almost surely, 2^85433221 is an apocalyptic number.

It is an amenable number.

85433221 is a deficient number, since it is larger than the sum of its proper divisors (1).

85433221 is an equidigital number, since it uses as much as digits as its factorization.

85433221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 85433221 is about 9243.0093043337. The cubic root of 85433221 is about 440.4286817277.

Adding to 85433221 its reverse (12233458), we get a palindrome (97666679).

The spelling of 85433221 in words is "eighty-five million, four hundred thirty-three thousand, two hundred twenty-one".