985365881 has 2 divisors, whose sum is σ = 985365882. Its totient is φ = 985365880.

The previous prime is 985365847. The next prime is 985365893. The reversal of 985365881 is 188563589.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972441856 + 12924025 = 31184^2 + 3595^2 .

It is an emirp because it is prime and its reverse (188563589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985365881 - 2⁶ = 985365817 is a prime.

It is a super-2 number, since 2×985365881² = 1941891838877812322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (985365581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492682940 + 492682941.

It is an arithmetic number, because the mean of its divisors is an integer number (492682941).

Almost surely, 2^985365881 is an apocalyptic number.

It is an amenable number.

985365881 is a deficient number, since it is larger than the sum of its proper divisors (1).

985365881 is an equidigital number, since it uses as much as digits as its factorization.

985365881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 53.

The square root of 985365881 is about 31390.5380807657. The cubic root of 985365881 is about 995.0979696973.

The spelling of 985365881 in words is "nine hundred eighty-five million, three hundred sixty-five thousand, eight hundred eighty-one".