985332181 has 4 divisors (see below), whose sum is σ = 986533164. Its totient is φ = 984131200.

The previous prime is 985332151. The next prime is 985332193. The reversal of 985332181 is 181233589.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 269288100 + 716044081 = 16410^2 + 26759^2 .

It is a cyclic number.

It is not a de Polignac number, because 985332181 - 2⁵ = 985332149 is a prime.

It is a super-2 number, since 2×985332181² = 1941759013828433522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985332151) 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, 599260 + ... + 600901.

It is an arithmetic number, because the mean of its divisors is an integer number (246633291).

Almost surely, 2^985332181 is an apocalyptic number.

It is an amenable number.

985332181 is a deficient number, since it is larger than the sum of its proper divisors (1200983).

985332181 is a wasteful number, since it uses less digits than its factorization.

985332181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200982.

The product of its digits is 51840, while the sum is 40.

The square root of 985332181 is about 31390.0012902198. The cubic root of 985332181 is about 995.0866252873.

It can be divided in two parts, 9853321 and 81, that multiplied together give a square (798119001 = 28251²).

The spelling of 985332181 in words is "nine hundred eighty-five million, three hundred thirty-two thousand, one hundred eighty-one".