109173409 has 2 divisors, whose sum is σ = 109173410. Its totient is φ = 109173408.

The previous prime is 109173401. The next prime is 109173437. The reversal of 109173409 is 904371901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83448225 + 25725184 = 9135^2 + 5072^2 .

It is a cyclic number.

It is not a de Polignac number, because 109173409 - 2³ = 109173401 is a prime.

It is not a weakly prime, because it can be changed into another prime (109173401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54586704 + 54586705.

It is an arithmetic number, because the mean of its divisors is an integer number (54586705).

Almost surely, 2^109173409 is an apocalyptic number.

It is an amenable number.

109173409 is a deficient number, since it is larger than the sum of its proper divisors (1).

109173409 is an equidigital number, since it uses as much as digits as its factorization.

109173409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 109173409 is about 10448.6079934123. The cubic root of 109173409 is about 477.9388018849.

The spelling of 109173409 in words is "one hundred nine million, one hundred seventy-three thousand, four hundred nine".