9667581 has 16 divisors (see below), whose sum is σ = 16071168. Its totient is φ = 5022000.

The previous prime is 9667531. The next prime is 9667583. The reversal of 9667581 is 1857669.

It is not a de Polignac number, because 9667581 - 2⁷ = 9667453 is a prime.

It is a super-2 number, since 2×9667581² = 186924244783122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9667583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20695 + ... + 21156.

It is an arithmetic number, because the mean of its divisors is an integer number (1004448).

Almost surely, 2^9667581 is an apocalyptic number.

It is an amenable number.

9667581 is a deficient number, since it is larger than the sum of its proper divisors (6403587).

9667581 is a wasteful number, since it uses less digits than its factorization.

9667581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41872.

The product of its digits is 90720, while the sum is 42.

The square root of 9667581 is about 3109.2733877869. The cubic root of 9667581 is about 213.0292670666.

It can be divided in two parts, 9 and 667581, that added together give a triangular number (667590 = T₁₁₅₅).

The spelling of 9667581 in words is "nine million, six hundred sixty-seven thousand, five hundred eighty-one".