161336409 has 16 divisors (see below), whose sum is σ = 245290752. Its totient is φ = 93443328.

The previous prime is 161336401. The next prime is 161336411. The reversal of 161336409 is 904633161.

It is not a de Polignac number, because 161336409 - 2³ = 161336401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161336409.

It is not an unprimeable number, because it can be changed into a prime (161336401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121009 + ... + 122334.

It is an arithmetic number, because the mean of its divisors is an integer number (15330672).

Almost surely, 2^161336409 is an apocalyptic number.

It is an amenable number.

161336409 is a deficient number, since it is larger than the sum of its proper divisors (83954343).

161336409 is a wasteful number, since it uses less digits than its factorization.

161336409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243376.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 161336409 is about 12701.8269945705. The cubic root of 161336409 is about 544.3908228632.

The spelling of 161336409 in words is "one hundred sixty-one million, three hundred thirty-six thousand, four hundred nine".