10009591 has 4 divisors (see below), whose sum is σ = 10026432. Its totient is φ = 9992752.

The previous prime is 10009567. The next prime is 10009603. The reversal of 10009591 is 19590001.

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

It is a cyclic number.

It is not a de Polignac number, because 10009591 - 2⁷ = 10009463 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 (10009511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7495 + ... + 8728.

It is an arithmetic number, because the mean of its divisors is an integer number (2506608).

Almost surely, 2^10009591 is an apocalyptic number.

10009591 is a deficient number, since it is larger than the sum of its proper divisors (16841).

10009591 is an equidigital number, since it uses as much as digits as its factorization.

10009591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16840.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 10009591 is about 3163.7937669829. The cubic root of 10009591 is about 215.5123242719.

Adding to 10009591 its reverse (19590001), we get a palindrome (29599592).

The spelling of 10009591 in words is "ten million, nine thousand, five hundred ninety-one".