109509409 has 2 divisors, whose sum is σ = 109509410. Its totient is φ = 109509408.

The previous prime is 109509299. The next prime is 109509437. The reversal of 109509409 is 904905901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61968384 + 47541025 = 7872^2 + 6895^2 .

It is a cyclic number.

It is not a de Polignac number, because 109509409 - 2¹¹ = 109507361 is a prime.

It is not a weakly prime, because it can be changed into another prime (109509469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54754704 + 54754705.

It is an arithmetic number, because the mean of its divisors is an integer number (54754705).

Almost surely, 2^109509409 is an apocalyptic number.

It is an amenable number.

109509409 is a deficient number, since it is larger than the sum of its proper divisors (1).

109509409 is an equidigital number, since it uses as much as digits as its factorization.

109509409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 109509409 is about 10464.6743379811. The cubic root of 109509409 is about 478.4286127733.

The spelling of 109509409 in words is "one hundred nine million, five hundred nine thousand, four hundred nine".