9661761 has 20 divisors (see below), whose sum is σ = 14588244. Its totient is φ = 6372000.

The previous prime is 9661759. The next prime is 9661777. The reversal of 9661761 is 1671669.

It can be written as a sum of positive squares in 2 ways, for example, as 9090225 + 571536 = 3015^2 + 756^2 .

It is not a de Polignac number, because 9661761 - 2¹ = 9661759 is a prime.

It is a super-2 number, since 2×9661761² = 186699251242242, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9661711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7591 + ... + 8771.

Almost surely, 2^9661761 is an apocalyptic number.

It is an amenable number.

9661761 is a deficient number, since it is larger than the sum of its proper divisors (4926483).

9661761 is a wasteful number, since it uses less digits than its factorization.

9661761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1285 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 9661761 is about 3108.3373369054. The cubic root of 9661761 is about 212.9865097586.

The spelling of 9661761 in words is "nine million, six hundred sixty-one thousand, seven hundred sixty-one".