985111281 has 32 divisors (see below), whose sum is σ = 1819545600. Its totient is φ = 511745040.

The previous prime is 985111249. The next prime is 985111289. The reversal of 985111281 is 182111589.

It is not a de Polignac number, because 985111281 - 2⁵ = 985111249 is a prime.

It is a super-2 number, since 2×985111281² = 1940888471906921922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (985111289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234841 + ... + 238998.

It is an arithmetic number, because the mean of its divisors is an integer number (56860800).

Almost surely, 2^985111281 is an apocalyptic number.

It is an amenable number.

985111281 is a deficient number, since it is larger than the sum of its proper divisors (834434319).

985111281 is a wasteful number, since it uses less digits than its factorization.

985111281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473866 (or 473860 counting only the distinct ones).

The product of its digits is 5760, while the sum is 36.

The square root of 985111281 is about 31386.4824566245. The cubic root of 985111281 is about 995.0122574519.

The spelling of 985111281 in words is "nine hundred eighty-five million, one hundred eleven thousand, two hundred eighty-one".