85142237 has 2 divisors, whose sum is σ = 85142238. Its totient is φ = 85142236.

The previous prime is 85142227. The next prime is 85142263. The reversal of 85142237 is 73224158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 12313081 = 8534^2 + 3509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85142237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85142227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42571118 + 42571119.

It is an arithmetic number, because the mean of its divisors is an integer number (42571119).

Almost surely, 2^85142237 is an apocalyptic number.

It is an amenable number.

85142237 is a deficient number, since it is larger than the sum of its proper divisors (1).

85142237 is an equidigital number, since it uses as much as digits as its factorization.

85142237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 85142237 is about 9227.2551173141. The cubic root of 85142237 is about 439.9280822540.

The spelling of 85142237 in words is "eighty-five million, one hundred forty-two thousand, two hundred thirty-seven".