10909175809 has 27 divisors (see below), whose sum is σ = 13029801057. Its totient is φ = 9106942824.

The previous prime is 10909175779. The next prime is 10909175813. The reversal of 10909175809 is 90857190901.

It is a happy number.

The square root of 10909175809 is 104447.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 10909175809 - 2¹³ = 10909167617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (10909172809) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 31438374 + ... + 31438720.

Almost surely, 2^10909175809 is an apocalyptic number.

10909175809 is the 104447-th square number.

10909175809 is the 52224-th centered octagonal number.

It is an amenable number.

10909175809 is a deficient number, since it is larger than the sum of its proper divisors (2120625248).

10909175809 is an frugal number, since it uses more digits than its factorization.

10909175809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 49.

Multiplying 10909175809 by its sum of digits (49), we get a square (534549614641 = 731129²).

10909175809 divided by its sum of digits (49) gives a square (222636241 = 14921²).

It can be divided in two parts, 109091 and 75809, that added together give a square (184900 = 430²).

The spelling of 10909175809 in words is "ten billion, nine hundred nine million, one hundred seventy-five thousand, eight hundred nine".