85529221 has 2 divisors, whose sum is σ = 85529222. Its totient is φ = 85529220.

The previous prime is 85529183. The next prime is 85529233. The reversal of 85529221 is 12292558.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 21288996 = 8015^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 85529221 - 2²⁵ = 51974789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85529251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42764610 + 42764611.

It is an arithmetic number, because the mean of its divisors is an integer number (42764611).

Almost surely, 2^85529221 is an apocalyptic number.

It is an amenable number.

85529221 is a deficient number, since it is larger than the sum of its proper divisors (1).

85529221 is an equidigital number, since it uses as much as digits as its factorization.

85529221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 34.

The square root of 85529221 is about 9248.2009601868. The cubic root of 85529221 is about 440.5935876270.

The spelling of 85529221 in words is "eighty-five million, five hundred twenty-nine thousand, two hundred twenty-one".