85283281 has 2 divisors, whose sum is σ = 85283282. Its totient is φ = 85283280.

The previous prime is 85283257. The next prime is 85283323. The reversal of 85283281 is 18238258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79566400 + 5716881 = 8920^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 85283281 - 2⁵ = 85283249 is a prime.

It is a super-2 number, since 2×85283281² = 14546476036249922, which contains 22 as substring.

It is equal to p_4959163 and since 85283281 and 4959163 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85283281.

It is not a weakly prime, because it can be changed into another prime (85283221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42641640 + 42641641.

It is an arithmetic number, because the mean of its divisors is an integer number (42641641).

Almost surely, 2^85283281 is an apocalyptic number.

It is an amenable number.

85283281 is a deficient number, since it is larger than the sum of its proper divisors (1).

85283281 is an equidigital number, since it uses as much as digits as its factorization.

85283281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 37.

The square root of 85283281 is about 9234.8947476406. The cubic root of 85283281 is about 440.1708719949.

The spelling of 85283281 in words is "eighty-five million, two hundred eighty-three thousand, two hundred eighty-one".