985109261 has 2 divisors, whose sum is σ = 985109262. Its totient is φ = 985109260.

The previous prime is 985109233. The next prime is 985109269. The reversal of 985109261 is 162901589.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520706761 + 464402500 = 22819^2 + 21550^2 .

It is a cyclic number.

It is not a de Polignac number, because 985109261 - 2¹⁸ = 984847117 is a prime.

It is a super-2 number, since 2×985109261² = 1940880512215932242, 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 (985109269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492554630 + 492554631.

It is an arithmetic number, because the mean of its divisors is an integer number (492554631).

Almost surely, 2^985109261 is an apocalyptic number.

It is an amenable number.

985109261 is a deficient number, since it is larger than the sum of its proper divisors (1).

985109261 is an equidigital number, since it uses as much as digits as its factorization.

985109261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 985109261 is about 31386.4502771499. The cubic root of 985109261 is about 995.0115773507.

The spelling of 985109261 in words is "nine hundred eighty-five million, one hundred nine thousand, two hundred sixty-one".