9811261 has 8 divisors (see below), whose sum is σ = 10429560. Its totient is φ = 9229504.

The previous prime is 9811231. The next prime is 9811303. The reversal of 9811261 is 1621189.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 164025 + 9647236 = 405^2 + 3106^2 .

It is not a de Polignac number, because 9811261 - 2⁵ = 9811229 is a prime.

It is a super-3 number, since 3×9811261³ (a number of 22 digits) contains 333 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 (9811231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3915 + ... + 5911.

It is an arithmetic number, because the mean of its divisors is an integer number (1303695).

Almost surely, 2^9811261 is an apocalyptic number.

It is an amenable number.

9811261 is a deficient number, since it is larger than the sum of its proper divisors (618299).

9811261 is an equidigital number, since it uses as much as digits as its factorization.

9811261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048 (or 2014 counting only the distinct ones).

The product of its digits is 864, while the sum is 28.

The square root of 9811261 is about 3132.2932493622. The cubic root of 9811261 is about 214.0794316016.

The spelling of 9811261 in words is "nine million, eight hundred eleven thousand, two hundred sixty-one".