85229281 has 2 divisors, whose sum is σ = 85229282. Its totient is φ = 85229280.

The previous prime is 85229257. The next prime is 85229321. The reversal of 85229281 is 18292258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 15673681 = 8340^2 + 3959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85229281 is a prime.

It is a super-2 number, since 2×85229281² = 14528060679553922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85229281.

It is not a weakly prime, because it can be changed into another prime (85229251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42614640 + 42614641.

It is an arithmetic number, because the mean of its divisors is an integer number (42614641).

Almost surely, 2^85229281 is an apocalyptic number.

It is an amenable number.

85229281 is a deficient number, since it is larger than the sum of its proper divisors (1).

85229281 is an equidigital number, since it uses as much as digits as its factorization.

85229281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 85229281 is about 9231.9705913743. The cubic root of 85229281 is about 440.0779493441.

The spelling of 85229281 in words is "eighty-five million, two hundred twenty-nine thousand, two hundred eighty-one".