109040509 has 4 divisors (see below), whose sum is σ = 110120220. Its totient is φ = 107960800.

The previous prime is 109040507. The next prime is 109040521. The reversal of 109040509 is 905040901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905040901 = 101 ⋅8960801.

It can be written as a sum of positive squares in 2 ways, for example, as 66504025 + 42536484 = 8155^2 + 6522^2 .

It is a cyclic number.

It is not a de Polignac number, because 109040509 - 2¹ = 109040507 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 (109040507) 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, 539704 + ... + 539905.

It is an arithmetic number, because the mean of its divisors is an integer number (27530055).

Almost surely, 2^109040509 is an apocalyptic number.

It is an amenable number.

109040509 is a deficient number, since it is larger than the sum of its proper divisors (1079711).

109040509 is a wasteful number, since it uses less digits than its factorization.

109040509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079710.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 109040509 is about 10442.2463579443. The cubic root of 109040509 is about 477.7447868192.

The spelling of 109040509 in words is "one hundred nine million, forty thousand, five hundred nine".