10809557 has 4 divisors (see below), whose sum is σ = 11792256. Its totient is φ = 9826860.

The previous prime is 10809553. The next prime is 10809571. The reversal of 10809557 is 75590801.

10809557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 10809557 - 2² = 10809553 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 (10809553) 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, 491333 + ... + 491354.

It is an arithmetic number, because the mean of its divisors is an integer number (2948064).

Almost surely, 2^10809557 is an apocalyptic number.

It is an amenable number.

10809557 is a deficient number, since it is larger than the sum of its proper divisors (982699).

10809557 is an equidigital number, since it uses as much as digits as its factorization.

10809557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982698.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 10809557 is about 3287.7890747431. The cubic root of 10809557 is about 221.1070712310.

The spelling of 10809557 in words is "ten million, eight hundred nine thousand, five hundred fifty-seven".