9216681 has 4 divisors (see below), whose sum is σ = 12288912. Its totient is φ = 6144452.

The previous prime is 9216661. The next prime is 9216689. The reversal of 9216681 is 1866129.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1866129 = 3 ⋅622043.

It is a cyclic number.

It is not a de Polignac number, because 9216681 - 2¹³ = 9208489 is a prime.

It is a super-2 number, since 2×9216681² = 169894417311522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9216689) 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, 1536111 + ... + 1536116.

It is an arithmetic number, because the mean of its divisors is an integer number (3072228).

Almost surely, 2^9216681 is an apocalyptic number.

It is an amenable number.

9216681 is a deficient number, since it is larger than the sum of its proper divisors (3072231).

9216681 is a wasteful number, since it uses less digits than its factorization.

9216681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072230.

The product of its digits is 5184, while the sum is 33.

The square root of 9216681 is about 3035.8987137255. The cubic root of 9216681 is about 209.6644755440.

The spelling of 9216681 in words is "nine million, two hundred sixteen thousand, six hundred eighty-one".