10009681 has 4 divisors (see below), whose sum is σ = 10919664. Its totient is φ = 9099700.

The previous prime is 10009679. The next prime is 10009691. The reversal of 10009681 is 18690001.

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: 18690001 = 11 ⋅1699091.

It is a cyclic number.

It is not a de Polignac number, because 10009681 - 2¹ = 10009679 is a prime.

It is a super-2 number, since 2×10009681² = 200387427443522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10009691) 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, 454975 + ... + 454996.

It is an arithmetic number, because the mean of its divisors is an integer number (2729916).

Almost surely, 2^10009681 is an apocalyptic number.

10009681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10009681 is a deficient number, since it is larger than the sum of its proper divisors (909983).

10009681 is an equidigital number, since it uses as much as digits as its factorization.

10009681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909982.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 10009681 is about 3163.8079903812. The cubic root of 10009681 is about 215.5129701874.

Adding to 10009681 its reverse (18690001), we get a palindrome (28699682).

The spelling of 10009681 in words is "ten million, nine thousand, six hundred eighty-one".