9581681 has 4 divisors (see below), whose sum is σ = 10086000. Its totient is φ = 9077364.

The previous prime is 9581669. The next prime is 9581683. The reversal of 9581681 is 1861859.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9581681 - 2¹⁰ = 9580657 is a prime.

It is a super-2 number, since 2×9581681² = 183617221571522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9581683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252131 + ... + 252168.

It is an arithmetic number, because the mean of its divisors is an integer number (2521500).

Almost surely, 2^9581681 is an apocalyptic number.

It is an amenable number.

9581681 is a deficient number, since it is larger than the sum of its proper divisors (504319).

9581681 is a wasteful number, since it uses less digits than its factorization.

9581681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504318.

The product of its digits is 17280, while the sum is 38.

The square root of 9581681 is about 3095.4290494211. The cubic root of 9581681 is about 212.3964413513.

The spelling of 9581681 in words is "nine million, five hundred eighty-one thousand, six hundred eighty-one".