9145681 has 4 divisors (see below), whose sum is σ = 9166500. Its totient is φ = 9124864.

The previous prime is 9145673. The next prime is 9145693. The reversal of 9145681 is 1865419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6051600 + 3094081 = 2460^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 9145681 - 2³ = 9145673 is a prime.

It is a super-2 number, since 2×9145681² = 167286961907522, which contains 22 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 (9145601) 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 3 ways as a sum of consecutive naturals, for example, 9736 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (2291625).

Almost surely, 2^9145681 is an apocalyptic number.

It is an amenable number.

9145681 is a deficient number, since it is larger than the sum of its proper divisors (20819).

9145681 is a wasteful number, since it uses less digits than its factorization.

9145681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20818.

The product of its digits is 8640, while the sum is 34.

The square root of 9145681 is about 3024.1826995074. The cubic root of 9145681 is about 209.1247090401.

The spelling of 9145681 in words is "nine million, one hundred forty-five thousand, six hundred eighty-one".