10008991 has 8 divisors (see below), whose sum is σ = 10581120. Its totient is φ = 9441432.

The previous prime is 10008983. The next prime is 10009003. The reversal of 10008991 is 19980001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10008991 - 2³ = 10008983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10008391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3996 + ... + 5998.

It is an arithmetic number, because the mean of its divisors is an integer number (1322640).

Almost surely, 2^10008991 is an apocalyptic number.

10008991 is a deficient number, since it is larger than the sum of its proper divisors (572129).

10008991 is a wasteful number, since it uses less digits than its factorization.

10008991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 10008991 is about 3163.6989426935. The cubic root of 10008991 is about 215.5080180694.

Adding to 10008991 its reverse (19980001), we get a palindrome (29988992).

The spelling of 10008991 in words is "ten million, eight thousand, nine hundred ninety-one".