161017409 has 4 divisors (see below), whose sum is σ = 184019904. Its totient is φ = 138014916.

The previous prime is 161017357. The next prime is 161017447. The reversal of 161017409 is 904710161.

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 161017409 - 2²⁰ = 159968833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161017469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11501237 + ... + 11501250.

It is an arithmetic number, because the mean of its divisors is an integer number (46004976).

Almost surely, 2^161017409 is an apocalyptic number.

It is an amenable number.

161017409 is a deficient number, since it is larger than the sum of its proper divisors (23002495).

161017409 is an equidigital number, since it uses as much as digits as its factorization.

161017409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23002494.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 161017409 is about 12689.2635326090. The cubic root of 161017409 is about 544.0317899261.

The spelling of 161017409 in words is "one hundred sixty-one million, seventeen thousand, four hundred nine".