85571237 has 2 divisors, whose sum is σ = 85571238. Its totient is φ = 85571236.

The previous prime is 85571221. The next prime is 85571243. The reversal of 85571237 is 73217558.

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., 69322276 + 16248961 = 8326^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 85571237 - 2⁴ = 85571221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85571237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85571207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42785618 + 42785619.

It is an arithmetic number, because the mean of its divisors is an integer number (42785619).

Almost surely, 2^85571237 is an apocalyptic number.

It is an amenable number.

85571237 is a deficient number, since it is larger than the sum of its proper divisors (1).

85571237 is an equidigital number, since it uses as much as digits as its factorization.

85571237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 38.

The square root of 85571237 is about 9250.4722582147. The cubic root of 85571237 is about 440.6657226216.

The spelling of 85571237 in words is "eighty-five million, five hundred seventy-one thousand, two hundred thirty-seven".