10091009 has 8 divisors (see below), whose sum is σ = 10314120. Its totient is φ = 9870336.

The previous prime is 10090999. The next prime is 10091021. The reversal of 10091009 is 90019001.

10091009 = 187² + 188² + ... + 332².

It can be written as a sum of positive squares in 4 ways, for example, as 1329409 + 8761600 = 1153^2 + 2960^2 .

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 10091009 - 2¹² = 10086913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10091069) 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 7 ways as a sum of consecutive naturals, for example, 9497 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (1289265).

Almost surely, 2^10091009 is an apocalyptic number.

It is an amenable number.

10091009 is a deficient number, since it is larger than the sum of its proper divisors (223111).

10091009 is a wasteful number, since it uses less digits than its factorization.

10091009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 10091009 is about 3176.6348546851. The cubic root of 10091009 is about 216.0950727451.

The spelling of 10091009 in words is "ten million, ninety-one thousand, nine".