985075681 has 4 divisors (see below), whose sum is σ = 985148164. Its totient is φ = 985003200.

The previous prime is 985075657. The next prime is 985075697. The reversal of 985075681 is 186570589.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 457960000 + 527115681 = 21400^2 + 22959^2 .

It is a 3-Lehmer number, since φ(985075681) divides (985075681-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985075681 is a prime.

It is a super-2 number, since 2×985075681² = 1940748194595227522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985075631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9060 + ... + 45301.

It is an arithmetic number, because the mean of its divisors is an integer number (246287041).

It is a Poulet number, since it divides 2^985075680-1.

Almost surely, 2^985075681 is an apocalyptic number.

985075681 is the 18121-st octagonal number.

It is an amenable number.

985075681 is a deficient number, since it is larger than the sum of its proper divisors (72483).

985075681 is a wasteful number, since it uses less digits than its factorization.

985075681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72482.

The product of its (nonzero) digits is 604800, while the sum is 49.

The square root of 985075681 is about 31385.9153283762. The cubic root of 985075681 is about 995.0002713735. Note that the first 3 decimals are identical.

The spelling of 985075681 in words is "nine hundred eighty-five million, seventy-five thousand, six hundred eighty-one".