9006991 has 8 divisors (see below), whose sum is σ = 10899360. Its totient is φ = 7266048.

The previous prime is 9006983. The next prime is 9007001. The reversal of 9006991 is 1996009.

It is a happy number.

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 9006991 - 2³ = 9006983 is a prime.

It is a super-2 number, since 2×9006991² = 162251773748162, 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 (9006971) 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, 37726 + ... + 37963.

It is an arithmetic number, because the mean of its divisors is an integer number (1362420).

Almost surely, 2^9006991 is an apocalyptic number.

9006991 is a deficient number, since it is larger than the sum of its proper divisors (1892369).

9006991 is a wasteful number, since it uses less digits than its factorization.

9006991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75713.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 9006991 is about 3001.1649404856. The cubic root of 9006991 is about 208.0622271288.

The spelling of 9006991 in words is "nine million, six thousand, nine hundred ninety-one".