985936181 has 2 divisors, whose sum is σ = 985936182. Its totient is φ = 985936180.

The previous prime is 985936153. The next prime is 985936219. The reversal of 985936181 is 181639589.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804629956 + 181306225 = 28366^2 + 13465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985936181 is a prime.

It is a super-2 number, since 2×985936181² = 1944140306009729522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985936681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492968090 + 492968091.

It is an arithmetic number, because the mean of its divisors is an integer number (492968091).

Almost surely, 2^985936181 is an apocalyptic number.

It is an amenable number.

985936181 is a deficient number, since it is larger than the sum of its proper divisors (1).

985936181 is an equidigital number, since it uses as much as digits as its factorization.

985936181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 985936181 is about 31399.6207142698. The cubic root of 985936181 is about 995.2899102186.

The spelling of 985936181 in words is "nine hundred eighty-five million, nine hundred thirty-six thousand, one hundred eighty-one".